Some cardiologists prescribe Viagra to help irregular heart rates for persons with end stage heart disease. Persons using nitrates or medicines containing nitrates should never use these three prescriptions. The combination can be fatal.
To obtain Cialis, Viagra or Levitra, the user must first obtain a prescription from a licensed physician. The quantity of the allotment is determined by the physician and will determine how many times per month the user can enjoy sex. Prescriptions can be renewed every thirty days with the doctor's approval. Users do not need a prescription to enjoy Tongkat Ali or its many benefits.
How PDE-5 Inhibitors Work
All three popular prescription medications are PDE- 5 inhibitors. These drugs are effective on approximately 65 percent of the men who use them.
Viagra - a sildenafil citrate manufactured by Pfizer. Cialis - a tadalafil derivative manufactured by Eli Lily. Levitra - a derivative of vardenafil hydrochloride made by GaxoSmithKlein and Bayer.