The usual recommended adult dose of cimetidine ranges from 200 mg twice a day to 600 mg 4 times a day (usually with meals and at bedtime), depending on the condition being treated. The maximum recommended dose of cimetidine is 2,400 mg.
Children's doses are based on the weight of the child, usually 20 mg to 40 mg per kilogram of body weight daily, divided into 4 doses.
Many things can affect the dose of a medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
Cimetidine can be taken with or without food.
It is important to take this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.