PRO-Vyril is an erectile dysfunction treatment produced by the somewhat shady pharmaceutical conglomerate Calenture-Deutz. Like Cialis or Viagra, it is produced in pill form; unlike them, it is not nearly as pronounced in its effects.
However, it turns out that the market has a niche for a kindler, gentler produced of erections in older men, and PRO-Vyril has been a solid if unspectacular earner for Calenture-Deutz.