Canonical authors add a third kind, the mixed interdict, which affects directly and immediately both persons and places; if, for instance, the interdict is issued against a town and its inhabitants, the latter are subject to it, even when they are outside of the town (arg. cap. xvi, De sent. excomm. in VI).
In other words what you have been taking is basically the Thai avamigran combined with an analgesic (pain reliever), a muscle relaxant and an anti-nausea drug. Taking avamigran (Thai) plus a pain reliever plus an anti-nausea med would likely achieve the same thing.
As you've no doubt gathered from the TV commercials, Viagra (sildenafil) is a drug used to treat erectile dysfunction (commonly called ED or impotence) in men who either can't have or can't maintain erections. On the market since March 1998, it is now available in generic form.