Depends on the location, I guess. I've had doctors prescribe trade names, which I don't understand if there are alternatives with the same dosage, route of administration and similar inactive ingredients. Not even talking about the "do not substitute" prescriptions which are also based on dubious information most of the time.
As for "sildenafil" - I don't think generic names are usually meaningful. Usually the suffix relates to the category of the drug, but the first letters seem as random as the letters in trade names. I could imagine a world where the generic name is viagrafil and the trade name is Silden.
Depends on the location, I guess. I've had doctors prescribe trade names, which I don't understand if there are alternatives with the same dosage, route of administration and similar inactive ingredients. Not even talking about the "do not substitute" prescriptions which are also based on dubious information most of the time.
As for "sildenafil" - I don't think generic names are usually meaningful. Usually the suffix relates to the category of the drug, but the first letters seem as random as the letters in trade names. I could imagine a world where the generic name is viagrafil and the trade name is Silden.