Cimetidine

**Semantic type:** Amino Acid, Peptide, or Protein|Pharmacologic Substance

**Definition:** A histamine H(2)-receptor antagonist. Enhancing anti-tumor cell-mediated responses, cimetidine blocks histamine's ability to stimulate suppressor T lymphocyte activity and to inhibit natural killer (NK) cell activity and interleukin-2 production. Cimetidine also may inhibit tumor growth by suppressing histamine's growth-factor activity and blocking histamine-induced stimulation of vascular endothelial growth factor (VEGF), a pro-angiogenic growth factor. (NCI04)

**Synonyms:** - CIMETIDINE - Guanidine, N''-Cyano-N-Methyl-N'-(2-(((5-Methyl-1H-Imidazol-4-yl)Methyl)Thio)Ethyl)- - N-Cyano-N'-methyl-N''-[2-[[(5-methyl-1H-imidazol-4-yl)methyl]thio]ethyl]guanidine - Tagamet - Tagamet - cimetidine