Acetildenafil (hongdenafil) is a synthetic drug which acts as a phosphodiesterase inhibitor. It is an structural analog, analog of sildenafil (Viagra) which has been detected in numerous different brands of supposedly "herbal" aphrodisiac products sold to boost libido and alleviate erectile dysfunction. A range of designer analogs of licensed cGMP specific phosphodiesterase type 5, PDE₅ inhibitors such as sildenafil and vardenafil have been detected in recent years in over-the-counter herbal aphrodisiac products, in an apparent attempt to circumvent both the legal restrictions on sale of erectile dysfunction drugs, which are Prescription drug, prescription-only medicines in most Western countries, and the patent protection which allows sale of these drugs by competitors only with permission from the patent holders (typically, under a license from the inventors) and to introduce efficacy into otherwise ineffective herbal products. These compounds have been demonstrated to display PDE₅ inhibitory activity ''in vitro'' and presumably have similar effects when consumed, but have undergone no formal testing in either humans or animals, and as such may represent significant health risks to consumers of these products due to their unknown safety profile. Attempts to ban such ingredients have not been successful for the most part, many jurisdictions having laws restricting chemical analogs but only those of narcotics and Doping_in_sport, doping agents. However, at least one court case has resulted in a product being taken off the market.

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{{Phosphodiesterase inhibitors Designer drugs Lactams PDE5 inhibitors Piceol ethers Piperazines Pyrazolopyrimidines Propyl compounds Ethoxy compounds

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