Cimetidine

from source

C10H16N6S · 252.34 g/mol

Ulcerfen · Cimetag · Acibilin · Acinil

Also sold as Tagamet from source

What is Cimetidine?

The first blockbuster stomach acid reducer, sold as Tagamet. It has been largely replaced by famotidine, which interferes with fewer other drugs. from source

CategoryOTC medicine

Chemical familyAmines

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Fig. 1 · 2D structure RDKit

SMILESCC1=C(N=CN1)CSCCNC(=NC)NC#N

Where you'll find it

Sold over the counter, without a prescription. Sold as Tagamet. See the rest of the otc medicine group.

Toxicity & hazards

DangerCorrosiveHealth hazardH318, H360, H373from source

Sources & methodology

PubChem CID: 2756
Wikidata: Q409492
Structure: PubChem → RDKit
Data refreshed: October 19, 2026

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