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What are H2 blockers?
H2 blockers, also known as H2 antagonists, are a group of antihistamine medications used to treat conditions related to stomach acid, including ulcers and acid reflux. Occasionally a doctor may recommend an H2 blocker to treat allergic reactions.
H2 blockers are available over the counter, without a prescription, and include ranitidine (Zantac), famotidine (Pepcid), cimetidine (Tagamet) and nizatidine (Tazac, Axid).
What happens if someone takes too much ranitidine, famotidine or another H2 blocker?
H2 blockers are very safe but can cause some mild symptoms if someone takes too much. These can include drowsiness and dizziness.
What should I do if someone has taken too much ranitidine, famotidine or another H2 blocker?
In most cases, you can just give the person a little water to drink. Call the poison center at 1-800-222-1222, chat online or text POISON to 85511 if the person feels drowsy or dizzy, or if you have other questions or concerns.
How can I prevent medication poisonings?
Use medications safely:
Store medications safely:
Get rid of medications safely:
See our medication page for more medication safety tips, including information on keeping young children and teens safe.
Last Updated: Wednesday September 7th 2016