You need a specific quantity of sexual stimulation for Viagra to function.
More InfoYou will have to adhere to all the instructions supplied by the medical professional or pharmacist.
More InfoWhen the person is not able to achieve an acceptable erection and is therefore incapable to have sex, ED is a condition.
More InfoJust if a greater dose is absolutely required it could be increased after speaking to your doctor - amounts above essential might provide you aching eyes and problems.