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What happens if I miss a dose (Tagamet, Tagamet HB)?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose (Tagamet, Tagamet HB)?

Seek emergency medical attention if you think you have used too much of this medicine. Overdose symptoms may include nausea, vomiting, diarrhea, confusion, extreme weakness, or fainting.

What should I avoid while taking cimetidine (Tagamet, Tagamet HB)?

If you also take ketoconazole (Nizoral), take it at least 2 hours before you take cimetidine.

Avoid taking antacids unless your doctor recommends them for heartburn pain. Follow your doctor's advice about the type of antacid to use and when to use it. You may not be able to take the antacid at the same time you take your dose of cimetidine.

What other drugs will affect cimetidine (Tagamet, Tagamet HB)?

Before taking this medication, tell your doctor if you are using any of the following medicines:

• a blood thinner (warfarin or Coumadin);
• clopidogrel (Plavix);
• phenytoin (Dilantin);
• nifedipine (Adalat);
• metronidazole (Flagyl);
• propranolol (Inderal);
• chlordiazepoxide (Librium);
• lidocaine (Xylocaine);
• diazepam (Valium);
• theophylline (Elixophyllin, Theo-24, Uniphyl); or
• depression or anxiety medication such as amitriptyline (Elavil), imipramine (Tofranil), clomipramine (Anafranil), desipramine (Norpramin), nortripytyline (Aventyl).

This list is not complete and there are many other drugs that can interact with cimetidine. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about cimetidine.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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