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Drugs and Health Products

Monograph: Caffeine

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Date: 2008-01-02

NHPID Name

Caffeine (USP 2008a)

Proper Name(s)

1,3,7-trimethylxanthine ( USP 2007 )

Common Name(s)

Caffeine ( USP 2007 , IOM 2003 )

Source Material


Route Of Administration

Oral ( Higdon and Frei 2006 )

Dosage Form(s)

Only allowable pharmaceutical dosage forms: tablets, capsules and strips. This monograph is not intended to include food-like dosage forms such as bars, chewing gums or beverages.

Use(s) or Purpose(s)

Statement(s) to the effect of:

Dose(s)

Adults:

Mild diuretic
Dose(s):
100 - 200 Milligrams per single dose , not to exceed 800 Milligrams per day

Directions For Use: Every 3 - 4 hours, as needed

Promotion of alertness and wakefulness, and enhancement of cognitive performance
Dose(s):
100 - 200 Milligrams per single dose , not to exceed 1000 Milligrams per day

Directions For Use: Every 3 - 4 hours, as needed

Relief of fatigue, promotion of endurance, and enhancement of motor performance
Dose(s):
100 - 200 Milligrams per single dose , not to exceed 1000 Milligrams per day

Directions For Use: Every 3 - 4 hours, as needed

Duration of use

For occasional use only  (Higdon and Frei 2006, Juliano and Griffiths 2004, Evans and Griffiths 1999)

Risk Information

Statement(s) to the effect of:

Caution(s) and Warning(s):

Contraindication(s):
No statement is required

Known Adverse Reaction(s):
  • Hypersensitivity/allergy is known to occur, in which case, discontinue use  (Infante et al. 2003, Hinrichs et al. 2002)
  • Doses greater than or equal to 601 Milligrams per day:
    Caffeine may cause anxiety, tachycardia (rapid heart rate), palpitations, insomnia, restlessness, nervousness, tremor and headache  (IOM 2001, Zhang 2001, Sawynok 1995)

Non-medicinal ingredients

Must be chosen from the current Natural Health Products Ingredients Database and must meet the limitations outlined in the database.

Specifications

  • The finished product specifications must be established in accordance with the requirements described in the NHPD Quality of Natural Health Products Guide.
  • The medicinal ingredient must comply with the requirements outlined in the Natural Health Products Ingredient Database (NHPID).

References cited

  • Arya LA, Myers DL, Jackson ND. Dietary caffeine intake and the risk for detrusor instability: a case-control study. Obstetrics and Gynecology 2000;96(1):85-89.
  • Ashihara H, Suzuki T. Distribution and biosynthesis of caffeine in plants. Frontiers in Bioscience 2004;9:1864-1876.
  • Avisar R, Avisar E, Weinberger D. Effect of coffee consumption on intraocular pressure. The Annals of Pharmacotherapy 2002;36(6):992-995.
  • Berardi RR, DeSimone EM, Newton GD, Oszko MA, Popovich NG, Rollins CJ, Shimp LA, Tietze KJ, editors. Handbook of Nonprescription Drugs: An Interactive Approach to Self-Care, 13th edition. Washington (DC): American Pharmaceutical Association; 2002.
  • Bouchard NC, Howland MA, Greller HA, Hoffman RS, Nelson LS. Ischemic stroke associated with use of an ephedra-free dietary supplement containing synephrine. Mayo Clinic Proceeding 2005;80(4):541-545.
  • Bui LT, Nguyen DT, Ambrose PJ. Blood pressure and heart rate effects following a single dose of bitter orange. The Annals of Pharmacotherapy 2006;40(1):53-57.
  • Chandrasekaran S, Rochtchina E, Mitchell P. Effects of caffeine on intraocular pressure: the Blue Mountains Eye Study. Journal of Glaucoma 2005;14(6):504-507.
  • Christopher G, Sutherland D, Smith A. Effects of caffeine in non-withdrawn volunteers. Human Psychopharmacology 2005;20(1):47-53.
  • Cornelis MC, El-Sohemy A. Coffee, caffeine, and coronary heart disease. Current Opinion in Lipidology 2007;18(1):13-19.
  • Creighton SM, Stanton SL. Caffeine: does it affect your bladder? British Journal of Urology 1990;66(6):613-614.
  • Doherty M, Smith PM. Effects of caffeine ingestion on rating of perceived exertion during and after exercise: a meta-analysis. Scandinavian Journal of Medicine & Science in Sports 2005;15(2):69-78.
  • Evans SM, Griffiths RR. Caffeine withdrawal: a parametric analysis of caffeine dosing conditions. The Journal of Pharmacology and Experimental Therapeutics 1999;289(1):285-294.
  • FDA 1988: Food and Drug Administration. 21 CFR Part 340. Stimulant drug products for over-the-counter human use; final monograph; final rule. Washington (DC): U.S. Food and Drug Administration, Department of Health and Human Services; 1988. [Accessed 2007-05-30]. Available from: http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&tpl=/ecfrbrowse/Title21/21cfr340_main_02.tpl.
  • FDA 2004: Food and Drug Administration. Sales of supplements containing ephedrine alkaloids (ephedra) prohibited. Washington (DC): Food and Drug Administration, US Department of Health and Human Services; 2004. [Accessed 2007-04-13]. Available from: http://www.fda.gov/oc/initiatives/ephedra/february2004/.
  • Gennaro AR, editor. Remington: The Science and Practice of Pharmacy, 20th edition. Washington (DC): Lippincott Williams and Wilkins; 2000
  • Greden JF. Anxiety or caffeinism: a diagnostic dilemma. American Journal of Psychiatry 1974;131(10):1089-1092.
  • Haller CA, Benowitz NL, Jacob P. Hemodynamic effects of ephedra-free weight-loss supplements in humans. The American Journal of Medicine 2005;118(9):998-1003.
  • Higdon JV, Frei B. Coffee and health: a review of recent human research. Critical Reviews in Food Science and Nutrition 2006;46(2):101-123.
  • Hinrichs R, Hunzelmann N, Ritzkowsky A, Zollner TM, Krieg T, Scharffetter-Kochanek K. Caffeine hypersensitivity. Allergy 2002;57(9):859-60.
  • Infante S, Baeza ML, Calvo M, De Barrio M, Rubio M, Herrero T. Anaphylaxis due to caffeine. Allergy 2003;58(7):681-682.
  • IOM 2001: Institute of Medicine. Committee on Military Nutrition Research, Food and Nutrition Board, Institute of Medicine. Caffeine for the Sustainment of Mental Task Performance: Formulations for Military Operations. Washington (DC): National Academy Press; 2001 [Accessed 2007-04-19]. Available from: http://books.nap.edu/openbook.php?isbn=0309082587.
  • IOM 2003: Institute of Medicine. Committee on Food Chemicals Codex, Food and Nutrition Board, Institute of Medicine. Food Chemicals Codex, 5th edition. Washington (DC): National Academies Press; 2003.
  • Jee SH, He J, Whelton PK, Suh II, Klag MJ. The effect of chronic coffee drinking on blood pressure: a meta-analysis of controlled clinical trials. Hypertension 1999;33(2):647-652.
  • Jefferson JW. Lithium tremor and caffeine intake: two cases of drinking less and shaking more. Journal of Clinical Psychiatry 1988;49(2):72-73.
  • Juliano LM, Griffiths RR. A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity, and associated features. Psychopharmacology 2004;176(1):1-29.
  • Kamimori GH, Penetar DM, Headley DB, Thorne DR, Otterstetter R, Belenky G. Effect of three caffeine doses on plasma catecholamines and alertness during prolonged wakefulness. European Journal of Clinical Pharmacology 2000;56(8):537-544.
  • Mester R, Toren P, Mizrachi I, Wolmer L, Karni N, Weizman A. Caffeine withdrawal increases lithium blood levels. Biological Psychiatry 1995;37(5):348-350.
  • Nawrot P, Jordan S, Eastwood J, Rotstein J, Hugenholtz A, Feeley M. Effects of caffeine on human health. Food Additives and Contaminants 2003;20(1):1-30.
  • Neuhäuser-Berthold M, Beine S, Verwied SC, Lührmann PM. Coffee consumption and total body water homeostasis as measured by fluid balance and bioelectrical impedance analysis. Annals of Nutrition and Metabolism 1997;41(1):29-36.
  • Noordzij M, Uiterwaal CS, Arends LR, Kok FJ, Grobbee DE, Geleijnse JM. Blood pressure response to chronic intake of coffee and caffeine: a meta-analysis of randomized controlled trials. Journal of Hypertension 2005;23(5):921-928.
  • Philip P, Taillard J, Moore N, Delord S, Valtat C, Sagaspe P, Bioulac B. The effects of coffee and napping on night time highway driving: a randomized trial. Annals of Internal Medicine 2006;144(11):785-791.
  • Sawynok J. Pharmacological rationale for the clinical use of caffeine. Drugs 1995;49(1):37-50.
  • Shirley DG, Walter SJ, Noormohamed FH. Natriuretic effect of caffeine: assessment of segmental sodium reabsorption in humans. Clinical Science 2002;103(5):461-466.
  • Smith A, Sutherland D, Christopher G. Effects of repeated doses of caffeine on mood and performance of alert and fatigued volunteers. Journal of Psychopharmacology 2005;19(6):620-626
  • USP 30: United States Pharmacopeia and the National Formulary (USP 30 - NF 25). Rockville (MD): United States Pharmacopeial Convention, Inc.; 2007.
  • Vahedi K, Domingo V, Amarenco P, Bousser MG. Ischaemic stroke in a sportsman who consumed MaHuang extract and creatine monohydrate for body building. Journal of Neurology, Neurosurgery and Psychiatry 2000;68(1):112-113.
  • Zajac MA, Zakrzewski AG, Kowal MG, Narayan S. A novel method of caffeine synthesis from uracil. Synthetic Communications 2003;33(19):3291-3297.
  • Zhang WY. A benefit-risk assessment of caffeine as an analgesic adjuvant. Drug Safety 2001;24(15):1127-1142.
  • Zimmerman DR. Zimmerman's Complete Guide to Nonprescription Drugs, 2nd edition. Detroit (MI): Gale Research Inc.; 1992.
  • Zwyghuizen-Doorenbos A, Roehrs TA, Lipschutz L, Timms V, Roth T. Effects of caffeine on alertness. Psychopharmacology 1990;100(1):36-39.

References reviewed

  • Ahmed SV, Jayawarna C, Jude E. Post lumbar puncture headache: diagnosis and management. Postgraduate Medical Journal 2006;82(973):713-716.
  • Ahrens JN, Crixell SH, Lioyd LK, Walker JL. The physiological effects of caffeine in women during treadmill walking. Journal of Strength and Conditioning Research 2007;21(1):164-168.
  • Ali M, Afzal M. A potent inhibitor of thrombin stimulated platelet thromboxane fromation from unprocessed tea. Prostaglandins, Leukotrienes and Medicine 1987;27(1):9-13.
  • Aqel RA, Zoghbi GJ, Trimm JR, Baldwin SA, Iskandrian AE. Effect of caffeine administered intravenously on intracoronary-administered adenosine-induced coronary hemodynamics in patients with coronary artery disease. The American Journal of Cardiology 2004;93(3):343-346.
  • Ascherio A, Weisskopf MG, O'Reilly EJ, McCullough ML, Calle EE, Rodriguez C, Thun MJ. Coffee consumption, gender, and Parkinson's disease mortality in the cancer prevention study II cohort: the modifying effects of estrogen. American Journal of Epidemiology 2004;160(10):977-984.
  • Astrup A, Toubro S, Cannon S, Hein P, Breum L, Madsen J. Caffeine: a double-blind, placebo-controlled study of its thermogenic, metabolic, and cardiovascular effects in healthy volunteers. The American Journal of Clinical Nutrition 1990;51(5):759-767.
  • Azcona O, Barbanoj MJ, Torrent J, Jane F. Evaluation of the central effects of alcohol and caffeine interaction. British Journal of Clinical Pharmacology 1995;40(4):393-400.
  • Balat O, Balat A, Ugur MG, Pence S. The effect of smoking and caffeine on the fetus and placenta in pregnancy. Clinical and Experimental Obstetrics and Gynecology 2003;30(1):57-59.
  • Bara AI, Barley EA. Caffeine for asthma. Oxfordshire (UK): The Cochrane Database of Systematic Reviews; 2001, Issue 4. Art. No.: CD001112. DOI: 10.1002/14651858.CD001112.
  • Barnett G, Segura J, De La Torre R, Carbo M. Pharmacokinetic determination of relative potency of quinolone inhibition of caffeine disposition. European Journal of Clinical Pharmacology 1990;39(1):63-69.
  • Barone, JJ, Roberts HR. Caffeine consumption. Food and Chemical Toxicology 1996;34(1):119-129.
  • Beach CA, Mays DC, Guiler RC, Jacober CH, Gerber N. Inhibition of elimination of caffeine by disulfiram in normal subjects and recovering alcoholics. Clinical Pharmacology and Therapeutics 1986;39(3):265-270.
  • Bell DG, Jacobs I, Ellerington K. Effect of caffeine and ephedrine ingestion on anaerobic exercise performance. Medicine and Science in Sports and Exercise 2001;33(8):1399-1403.
  • Bell DG, McLellan TM, Sabiston CM. Effect of ingesting caffeine and ephedrine on 10-km run performance. Medicine and Science in Sports and Exercise 2002;34(2):344-349.
  • Belza A, Frandsen E, Kondrup J. Body fat loss achieved by stimulation of thermogenesis by a combination of bioactive food ingredients: a placebo-controlled, double-blind 8-week intervention in obese subjects. International Journal of Obesity 2007;31(1):121-130.
  • Bernstein GA, Carroll ME, Crosby RD, Perwien AR, Go FS, Benowitz NL. Caffeine effects on learning, performance, and anxiety in normal school-age children. Journal of the American Academy of Child and Adolescent Psychiatry 1994;33(3):407-415.
  • Bott Kaspar. 1983. Preparation of caffeine. United States Patent US 4380631. 1983-04-19.
  • Brown NJ, Ryder D, Branch RA. A pharmacodynamic interaction between caffeine and phenylpropanolamine. Clinical Pharmacology and Therapeutics 1991;50(4):363-371.
  • Bruce CR, Anderson ME, Fraser SF, Stepto NK, Klein R, Hopkins WG, Hawley JA. Enhancement of 2000-m rowing performance after caffeine ingestion. Medicine and Science in Sports and Exercise 2000;32(11):1958-1963.
  • Carbo M, Segura J, De La Torre R, Badenas JM, Cami J. Effect of quinolones on caffeine disposition. Clinical Pharmacology and Therapeutics 1989;45(3):234-240.
  • Carrillo JA, Benitez J. Clinically significant pharmacokinetic interactions between dietary caffeine and medications. Clinical Pharmacokinetics 2000;39(2):127-153.
  • Cavalcante JW, Santos PR, Menezes MG, Marques HO, Cavalcante LP, Pacheco WS. Influence of caffeine on blood pressure and platelet aggregation. Arquivos Brasileiros de Cardiologia 2000;75(2):97-105.
  • Choi A, Laurito CE, Cunningham FE. Pharmacologic management of postdural puncture headache. Annals of Pharmacotherapy 1996;30(7-8):831-839.
  • Culm-Merdek KE, Von Moltke LL, Harmatz JS, Greenblatt DJ. Fluvoxamine impairs single-dose caffeine clearance without altering caffeine pharmacodynamics. British Journal of Clinical Pharmacology 2005;60(5):486-493.
  • Devoe LD, Murray C, Youssif A, Arnaud M. Maternal caffeine consumption and fetal behaviour in the normal third-trimester pregnancy. American Journal of Obstetrics and Gynecology 1993;168(4):1105-1111.
  • Dickerson LM, Mazyck PJ, Hunter MH. Premenstrual syndrome. American Family Physician 2003;67(8):1743-1752.
  • Du Y, Melchert HU, Knopf H, Braemer-Hauth M, Gerding B, Pabel E. Association of serum caffeine concentrations with blood lipids in caffeine-drug users and nonusers - results of German National Health Surveys from 1984 to 1999. European Journal of Epidemiology 2005;20(4):311-316.
  • Edwards RG. An evaluation of the health aspects of caffeine as a food ingredient. Washington (DC): Arent Fox Kintner Plotkin & Kahn; 1997.
  • Food and Drug Administration. Federal Register Volume 53, Number 221, page 46201. Washington (DC): U.S. Food and Drug Administration, Department of Health and Human Services. November 16, 1988.
  • Food and Drug Administration. Federal Register Volume 53, Number 39, page 6105. Washington (DC): U.S. Food and Drug Administration, Department of Health and Human Services. February 29, 1988.
  • Foxx RM, Rubinoff A. Behavioral treatment of caffeinism: reducing excessive coffee drinking. Journal of Applied Behavior Analysis 1979;12(3):335-344.
  • Fudin R, Nicastro R. Can caffeine antagonize alcohol-induced performance decrements in humans? Perceptual and Motor Skills 1988;67(2):375-391.
  • Goldstein J, Silberstein SD, Saper JR, Ryan RE, Lipton RB. Acetaminophen, aspirin, and caffeine in combination versus ibuprofen for acute migraine: results from a multicenter, double-blind, randomized, parallel-group, single-dose, placebo-controlled study. Headache 2006;46(3):444-453.
  • Greenberg JA, Boozer CN, Geliebter A. Coffee, diabetes, and weight control. The American Journal of Clinical Nutrition 2006;84(4):682-693.
  • Grobbee DE, Rimm EB, Giovannucci E, Colditz G, Stampfer M, Willett W. Coffee, caffeine, and cardiovascular disease in men. New England Journal of Medicine 1990;323(15):1026-1032.
  • Hagg S, Spigset O, Mjorndal T, Dahlqvist R. Effect of caffeine on clozapine pharmacokinetics in healthy volunteers. British Journal of Clinical Pharmacology 2000;49(1):59-63.
  • Hallstorm H, Wolk A, Gynn A, Michaelsson K. Coffee, tea and caffeine consumption in relation to osteoporotic fracture risk in a cohort of Swedish women. Osteoporosis International. 2006;17(7):1055-1064.
  • Haskell CF, Kennedy DO, Wesnes KA , Milne AL, Scholey AB. Double-blind, placebo-controlled, multi-dose evaluation of the acute behavioural effects of guarana in humans. Journal of Psychopharmacology 2007;21(1):65-70.
  • Ishizuk H, Eguchi H, Oda T, Ogawaf S, Nakagawa K, Honjo S, Kono S. Relation of coffee, green tea, and caffeine intake to gallstone disease in middle-aged Japanese men. European Journal of Epidemiology 2003;18(5):401-405.
  • Jeppesen U, Loft S, Poulsen HE, Brsen K. A fluvoxamine-caffeine interaction study. Pharmacogenetics 1996;6(3):213-222.
  • Joeres R, Klinker H, Heusler H, Epping J, Richter E. Influence of mexiletine on caffeine elimination. Pharmacology and Therapeutics 1987;33(1):163-169.
  • Kiyohara C, Kono S, HonJo S, Todoroki I, Sakurai Y, Nishikawa H, Kogo H, Ogawa S, Nakagawa K. Inverse association between coffee drinking and serum uric acid concentrations in middle-aged Japanese males. British Journal of Nutrition 1999;82(2):125-130.
  • Kleemola P, Jousilahti P, Pietinen P, Vartiainen E, Tuomilehto J. Coffee consumption and the risk of coronary heart disease and death. Archives of Internal Medicine 2000;160(22):3393-4000.
  • Labbe L, Abolfathi Z, Robitaille NM, St-Maurice F, Gilbert M, Turgeon J. Stereoselective disposition of the antiarrhythmic agent mexiletine during the concomitant administration of caffeine. Therapeutic Drug Monitoring 1999;21(2):191-199.
  • Lake CR, Rosenberg DB, Gallant S, Zaloga G, Chernow B. Phenylpropanolamine increases plasma caffeine levels. Clinical Pharmacology and Therapeutics 1990;47(6):675-685.
  • Laska EM, Sunshine A, Mueller F, Elvers WB, Siegel C, Rubin A. Caffeine as an analgesic adjuvant. Journal of the American Medical Association 1984;251(130):1711-1718.
  • Leitzmann MF, Stampfer MJ, Willett WC, Spiegelman D, Colditz GA, Giovannucci EL. Coffee intake is associated with lower risk of symptomatic gallstone disease in women. Gastroenterology 2002;123(6):1823-1830.
  • Leitzmann MF, Willett WC, Rimm EB, Stampfer MJ, Spiegelman D, Colditz GA, Giovannucci E, Lin W, Geiderman J. Myth: fluids, bed rest, and caffeine are effective in preventing and treating patients with post-lumbar puncture headache. The Western Journal of Medicine 2002;176(1):69-70.
  • Leitzmann MF, Willett WC, Rimm EB, Stampfer MJ, Spiegelman D, Colditz GA, Giovannucci E. A prospective study of coffee consumption and the risk of symptomatic gallstone disease in men. The Journal of the American Medical Association 1999;281(22):2106-2112.
  • Lipton RB, Stewart WF, Ryan RE, Saper J, Silberstein S, Sheftell F. Efficacy and safety of acetaminophen, aspirin, and caffeine in alleviating migraine headache pain: three double-blind, randomized, placebo-controlled trials. Archives of Neurology 1998;55(2):210-217.
  • Maillard C, Babadjamian A, Balansard G, Ollivier B, Bamba D. Study of caffeine - catechin association in lyophilized fresh seeds and in stabilized extract of cola nitida. Planta Medica 1985;51(6):515-517.
  • Malinow MR, Bostom AG, Krauss RM. Homocyst(e)ine, diet, and cardiovascular diseases: a statement for healthcare professionals from the Nutrition Committee, American Heart Association. Circulation 1999;99(1):178-182.
  • May DC, Jarboe CH, VanBakel AB, Williams WM. Effects of cimetidine on caffeine disposition in smokers and nonsmokers. Clinical Pharmacology and Therapeutics 1982;31(5):656-661.
  • Meyers BM, Cafarelli E. Caffeine increases time to fatigue by maintaining force and not by altering firing rates during submaximal isometric contractions. Journal of Applied Physiology 2005;99(3):1056-1063.
  • Migliardi JR, Armellino JJ, Friedman M, Gillings DB, Beaver WT. Caffeine as an analgesic adjuvant in tension headache. Clinical Pharmacology and Therapeutics 1994;56(5):576-586.
  • Min B, Cios D, Kluger J, White CM. Absence of QTc-interval-prolonging or hemodynamic effects of a single dose of bitter-orange extract in healthy subjects. Pharmacotherapy 2005;25(12):1719-1724.
  • Myers MG, Basinski A. Coffee and coronary heart disease. Archives of Internal Medicine 1992;152(9):1767-1772.
  • Norlock FE. Benign breast pain in women: a practical approach to evaluation and treatment. Journal of the American Medical Women's Association 2002;57(2):85-90.
  • Olak-Bialon B, Marcisz C, Jonderko G, Olak Z, Szymszal J, Orzel A. [Does coffee drinking influence serum uric acid concentration?] Wiadomosci lekarskie 2004;57(Supplement 1):233-237 (in Polish).
  • Papaioannou TG, Vlachopoulos C, Ioakeimidis N, Alexopoulos N, Stefanadis C. Nonlinear dynamics of blood pressure variability after caffeine consumption. Clinical Medicine and Research 2006;4(2):114-118.
  • Passmore AP, Kondowe GB, Johnston GD. Renal and cardiovascular effects of caffeine: a dose-response study. Clinical Science 1987;72(6):749-756.
  • Phillips-Bute BG, Lane JD. Caffeine withdrawal symptoms following brief caffeine deprivation. Physiological Behavior 1997;63(1):35-39.
  • Pollock BG, Wylie M, Stack JA, Sorisio DA, Thompson DS, Kirshner MA, Folan MM, Condifer KA. Inhibition of caffeine metabolism by estrogen replacement therapy in postmenopausal women. Journal of Clinical Pharmacology 1999;39(9):936-940.
  • Przybilla B, Ring J, Burg G. [Anaphylaxis following ingestion of coffee, chronic urticaria and analgesics idiosyncrasy]. Der Hautarzt; Zeitschrift für Dermatologie, Venerologie, und verwandte Gebiete 1983;34(2):73-76 (in German).
  • Raaska K, Raitasuo V, Laitila J, Neuvonen PJ. Effect of caffeine-containing versus decaffeinated coffee on serum clozapine concentrations in hospitalised patients. Basic and Clinical Pharmacology and Toxicology 2004;94(1):13-18.
  • Rapuri PB, Gallagher JC, Kinyamu HK, Ryschon KL. Caffeine intake increases the rate of bone loss in elderly women and interacts with vitamin D receptor genotypes. American Journal of Clinical Nutrition 2001;74(5):694-700.
  • Rasheed P, Al-Sowielem LS. Prevalence and predictors of premenstrual syndrome among college-aged women in Saudi Arabia. Annals of Saudi Medicine 2003;23(6):381-387.
  • Riesenhuber A, Boehm M, Posch M, Aufricht C. Diuretic potential of energy drinks. Amino Acids 2006;31(1):81-83.
  • Ross GW, Abbott RD, Petrovitch H, Morens DM, Grandinetti A, Tung KH, Tanner CM, Masaki KH, Blanchette PL, Curb JD, Popper JS, White LR. Association of coffee and caffeine intake with the risk of Parkinson's disease. The Journal of the American Medical Association 2000;283(20):2674-2679.
  • Rossignol AM, Bonnlander H, Song L, Phillis JW. Do women with premenstrual symptoms self-medicate with caffeine? Epidemiology 1991;2(6):403-408.
  • Rossignol AM, Bonnlander H. Caffeine-containing beverages, total fluid consumption, and premenstrual syndrome. American Journal of Public Health 1990;80(9):1106-1110.
  • Rossignol AM, Zhang JY, Chen YZ, Xiang Z. Tea and premenstrual syndrome in the People's Republic of China. American Journal of Public Health 1989;79(1):67-69.
  • Rossignol AM. Caffeine-containing beverages and premenstrual syndrome in young women. American Journal of Public Health 1985;75(11):1335-1337.
  • Salazar-Martinez E, Willett WC, Ascherio A, Manson JE, Leitzmann MF, Stampfer MJ, Hu FB. Coffee consumption and risk for type 2 diabetes mellitus. Annals of Internal Medicine 2004;140(1):1-8.
  • Sanderink GJ, Bournique B, Stevens J, Petry M, Martinet M. Involvement of human CYP1A isoenzymes in the metabolism and drug interactions of riluzole in vitro. The Journal of Pharmacology and Experimental Therapy 1997;282(3):1465-1472.
  • Santos IS. Caffeine intake and pregnancy outcomes: a meta-analytic review. Cadernos de Saúde Pública 1998;14(3):523-530.
  • Schmidt B, Roberts RS, Davis P, Doyle LW, Barrington KJ, Ohlesson A, Solimano A, Tin W. Caffeine therapy for apnea of prematurity. The New England Journal of Medicine 2006;354(20):2112-2121.
  • Simon O, Cohen L, Pierrot-Deseilligny C. [Post-lumbar puncture syndrome. Causes, prevention, treatments]. Revue Neurologique 1997;153(10):605-608 (in French).
  • Smith A. Effects of caffeine on human behavior. Food and Chemical Technology 2002;40(9):1243-1255.
  • Smith B, Wingard DL, Smith TC, Kritz-Silverstein D, Barrett-Connor E. Does coffee consumption reduce the risk of type 2 diabetes in individuals with impaired glucose? Diabetes Care 2006;29(11):2385-2390.
  • Smith PF, Smith A, Miners J, McNeil J, Proudfoot A. Report from the Expert Working Group on the Safety Aspects of Dietary Caffeine. Canberra (AU): Australian New Zealand Food Authority; 2000.
  • Stavric B. An update on research with coffee/caffeine (1989-1990). Food and Chemical Toxicology 1992;30(6):533-555.
  • Steer PA, Flenady VJ, Shearman A, Lee TC, Tudehope DI, Charles BG. Periextubation caffeine in preterm neonates: a randomized dose response trial. Journal of Paediatrics and Child Health 2003;39(7):511-515.
  • Stuart GR, Hopkin WG, Cook C, Cairns SP. Multiple effects of caffeine on simulated high-intensity team-sport perfromance. Medicine and Science in Sports and Exercise 2005;37(11):1998-2005.
  • Urgert R, Katan MB. The cholesterol-raising factor from coffee beans. Annual Review of Nutrition 1997;17:305-324.
  • Urgert R, Van Vliet T, Zock PL, Katan MB. Heavy coffee consumption and plasma homocysteine: a randomized controlled trial in healthy volunteers. The American Journal of Clinical Nutrition 2000;72(5):1107-1110.
  • Van Dusseldorp M, Katan MB. Headache caused by caffeine withdrawal among moderate coffee drinkers switched from ordinary to decaffeinated coffee: a 12 week double blind trial. British Medical Journal 1990;300(6739):1558-1559.
  • Vandenberghe K, Gillis N, Van Leemputte M, Van Hecke P, Vanstapel F, Hespel P. Caffeine counteracts the ergogenic action of muscle creatine loading. Journal of Applied Physiology 1996;80(2):452-457.
  • Varani K, Portaluppi F, Gessi S, Merighi S, Ongini E, Belardinelli L, Borea PA. Dose and time effects of caffeine intake on human platelet adenosine A(2A) receptors: functional and biochemical aspects. Circulation 2000;102(3):285-289.
  • Verhoef P, Pasman WJ, Van Vliet T, Urgert R, Katan MB. Contribution of caffeine to the homocysteine-raising effect of coffee: a randomized controlled trial in humans. The American Journal of Clinical Nutrition 2002;76(6):1244-1248.
  • Wahllander A, Paumgartner G. Effect of ketoconazole and terbinafine on the pharmacokinetics of caffeine in healthy volunteers. European Journal of Clinical Pharmacology 1989;37(3):279-283.
  • Watson JM, Jenkins EJ, Hamilton P, Lunt MJ, Kerr D. Influence of caffeine on the frequency and perception of hypoglycemia in free-living patients with type 1 diabetes. Diabetes Care 2000;23(4):455-459.
  • Westerterp-Plantenga MS, Lejeune MP, Kovacs EM. Body weight loss and weight maintenance in relation to habitual caffeine intake and green tea supplementation. Obesity Research 2005;13(7):1195-1204.
  • Yucel A, Ozyalcin S, Talu GK, Yucel EC, Erdine S. Intravenous administration of caffeine sodium benzoate for postdural puncture headache. Regional Anesthesia and Pain Medicine 1999;24(1):51-54.