Viagra and other medicines some medicines can change the way that Viagra works. It says to his doctor (or it fills to the form the consultation online here) on any medicine that you are taking. This includes the prescription and medicines or the remedies of nonprescription. It remembers, Viagra must never be used with the medicines that contain nitrates (it sees that Viagra is not for each). Viagra is not due to use with no other treatments medical that cause erections. These treatments include the pills, the medicines that become congested or they are inserted in the penis, you implant or the vacuum pumps.