More Details on H2 Blockers

Side Effects

(This article covers many, but not all, of the possible side effects with H2 blockers. Your healthcare provider can discuss a more complete list of side effects with you. You can also read about specific side effects for each type of H2 blocker by going to the specific drug within eMedTV.)
As with any medicine, there are possible side effects with H2 blockers. However, not everyone who takes an H2 blocker will experience side effects. In fact, most people tolerate them well.
When side effects do occur, in most cases they are minor and either require no treatment or can easily be treated by you or your healthcare provider. Serious side effects are less common.
Some of the most common side effects of H2 blockers include:
  • Abdominal pain (or stomach pain)
  • Breast enlargement in men (gynecomastia)
  • Constipation
  • Diarrhea
  • Dizziness
  • Drowsiness
  • Headaches
  • An irritated or runny nose
  • Nausea or vomiting
  • Pain
  • Rash
  • A sore throat
  • Weakness.
(Click H2 Blocker Side Effects to learn about the specific side effects of H2 blockers, including possible serious side effects to look out for.)

What Should I Tell My Healthcare Provider Before Taking an H2 Blocker?

You should talk with your healthcare provider prior to taking this type of medication if you have:
  • Kidney disease or kidney failure
  • Liver disease, including liver failure or cirrhosis
  • Acute porphyria
  • Phenylketonuria
  • Any allergies, including allergies to food, dyes, or preservatives.
Also let your healthcare provider know if you:
You should also be sure to tell your healthcare provider about all of the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Precautions and Warnings With H2 Blockers for more information on this topic, including information on who should not take H2 blockers.)

What Are H2 Blockers?

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