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Cimetidine is classified in the family of pharmacy drugs known as H2 blockers. It is prescribed by physicians for treatment of acid reflux / GERD, ulcers of the stomach and intestines, stomach and throat problems, heartburn, and more. Cimetidine is sometimes given to patients during anesthesia to help prevent aspiration pneumonia. In general, cimetidine is used to treat many conditions and provide relief to the symptoms that regularly present.

How to Use Cimetidine

Cimetidine can be compounded into many forms of delivery from tablet to injectable. Talk to your compounding pharmacist about your options for delivery and he or she will work with your physician to find the best option for your condition, age, and ability. Take cimetidine orally with or without food as directed by your physician. Follow dosage and usage directions carefully and adhere to a consistent schedule of delivery.

Possible Side Effects

Side effects may differ from individual to individual with some patients experiencing no side effects at all, while others may experience one or more side effects. Commonly seen side effects with cimetidine are as follows:

  • Dizziness
  • Headaches
  • Diarrhea
  • Constipation
  • Drowsiness
  • Insomnia
  • Nausea
  • Muscle Pain
  • Vomiting

Monitor your condition closely and seek medical assistance if any of the side effects listed above are becoming worse or lingering, or if you encounter other side effects that are troubling or worsening. Patients who experience any of the following serious side effects should contact their physician right away or seek emergency medical treatment:

  • Depression
  • Excitement
  • Confusion
  • Nervous Feeling
  • Anxiety
  • Decreased Sexual Ability
  • Breast Enlargement
  • Muscle Pain
  • Muscle Weakness
  • Severe Pain in Stomach
  • Lingering Stomach Pain
  • Unusual Bleeding
  • Unusual Bruising
  • Allergic Reaction Signs (hives, breathing problems, chest tightness, swelling, itching)
  • Fast Heartbeat
  • Slow Heartbeat


Cimetidine is excreted into human milk. Patients who are breast-feeding or planning to breast-feed are advised to not take cimetidine unless they have consulted with their physician regarding its use and potential risks.

Cimetidine is not recommended for use by pregnant women or women planning to become pregnant unless their primary care physician has decided that the benefits of using cimetidine outweigh the risks.

Do not take cimetidine if you have any of the following diseases or conditions unless your primary care physician has decided cimetidine is necessary for your treatment.

  • Liver Problems
  • Stomach Cancer
  • Moderate to Severe Kidney Impairment

Always talk to your physician and discuss your medical history and medications before beginning use of any new drug.

Cimetidine is contraindicated for patients taking any of the following medications:

  • Dofetilide
  • Cisapride
  • Nitrosoureas
  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA