“Clonidine (10−7M to 10−5M), …−6M), aspirin (10−3M), ketanserin (10−8M) and (±) CP 96,345 (10−6M), an … of neurokinin NK1 receptor, completely prevented the effects of capsaicin on the Kf,c. In contrast, terfenadine (10−7) together … cimetidine (10−5M) had no protective effect against capsaicin.”