Drug Index


Mechanism :

Cimetidine competitively inhibits the action of histamine at the histamine H2 receptors of the parietal cells and thus is a histamine H2-receptor antagonist. Cimetidine contains an imidazole ring and is chemically related to histamine.

Indication :

  • Esophagitis
  • Peptic ulcer, Duodenal ulcer
  • Zollinger Ellison syndrome
  • GERD
  • GI bleed

Contraindications :

Cimetidine is contraindicated for patients known to have hypersensitivity to the product.

Dosing :

5-10 mg/kg/day PO 8-12 hourly.
1 month-1 year:
10-20 mg/kg/day PO 6-12 hourly.
1-18 years:
20-40 mg/kg/day PO 6 hourly. Max: 1600 mg/day.

Adverse Effect :

Diarrhea, headache, tiredness, gynecomastia, hepatitis, rash, dry skin, seborrheic dermatitis, erythema annulare centrifugum, erythema multiforme, Stevens-Johnson syndrome, exfoliative dermatitis, toxic epidermal necrolysis, reversible alopecia.

Interaction :

Warfarin-Type Anticoagulants, Phenytoin, Propranolol, Nifedipine, Chlordiazepoxide, Diazepam, Certain Tricyclic Antidepressants, Lidocaine, Theophylline and Metronidazole: Increases metabolism of these drugs.
Ketoconazole: Alteration of pH may affect absorption.

Renal Dose :

Dose in Renal Impairment GFR (mL/min)
20-50Dose as in normal renal function
10-2050% of normal dose
<1050% of normal dose

Dose in Patients undergoing Renal Replacement Therapies
CAPDNot dialysed. Dose as in GFR<10 mL/min
HDDialysed. Dose as in GFR<10 mL/min
HDF/High fluxDialysed. Dose as in GFR<10 mL/min
CAV/VVHDNot dialysed. 300 mg every 8 hours

Hepatic Dose :

Use a reduced dose in severe hepatic impairment.
01/19/2024 01:18:42 Cimetidine
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