Can horny goat weed and cialis be used together?

Icariin, the main ingredient of horny goat weed, and cialis have the same therapeutic mechanism which inhibits the activity of the PDE5 that’s blocking dilation of the arteries in the penis; however, we could not scientifically assess the supplement's strength so using both together may potentiate side effects. To be safe, you should use cialis with adjusted dose (5 to 20 mg) for a desired effect.