Laropiprant

**Semantic type:** Pharmacologic Substance

**Definition:** A prostaglandin D2 receptor (DP1) antagonist with niacin-induced vasodilation inhibiting activity. Laropiprant binds to and inhibits the activity of DP1, a G-protein coupled receptor. Via competing with prostaglandin D2 (PG D2) for binding to DP1, this agent prevents PG D2-induced vasodilation and increased blood flow. As niacin induces the synthesis of PG D2, predominantly in the skin, administration of laropiprant may prevent niacin-induced vasodilation in the skin and facial flushing.

**Synonyms:** - (-)-((3R)-4-(4-Chlorobenzyl)-7-fluoro-5-(methylsulfonyl)-1,2,3,4-tetrahydrocyclopenta(b)indol-3-yl)acetic Acid - LAROPIPRANT - MK-0524 - MK0524