Phentermine is a stimulant and appetite suppressant. It works as an appetite suppressant likely as a result of being a CNS stimulant. Fenfluramine was formerly used as an appetite suppressant to treat obesity. As a neuropeptide, CGRP acts as an appetite suppressant and contributes to gastric acid secretion. In herbal medicine hyssop is believed to have soothing, expectorant, and cough suppressant properties. The drug has also been used as an appetite suppressant in Europe. It had been reported to have abuse potential as an appetite suppressant and sympathomimetic agent. One such example is fenfluramine, which was previously marketed as an appetite suppressant. Its main medical use is to control fulminant diarrhea, and as an antitussive (cough suppressant). The practice dates to early knowledge of nicotine as an appetite suppressant. It is considered less addictive than the other common weak opiate cough suppressant, codeine. In the drug Coricidin, chlorphenamine is combined with the cough suppressant dextromethorphan. Shoard also described the film as "Less a film than an appetite suppressant". In Guyana and the Amazon region, it is a popular cough suppressant, emollient, and diuretic. Also acts as a cough suppressant.