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In 1994, Pfizer scientists discovered that sildenafil, which also inhibits the PDE5 enzyme, caused penile erection in males participating in a clinical study of a heart medicine. Although ICOS scientists were not testing compound IC351 for treating ED, they recognized its potential usefulness for treating that disorder. Soon, in 1994, ICOS received a patent for compound IC351 (structurally unlike sildenafil and vardenafil), and Phase 1 clinical trials began in 1995. In 1997, the Phase 2 clinical studies were initiated for males experiencing ED, then progressed to the Phase 3 trials that supported the drug's FDA approval.

It actually may be helpful if you’re trying for a baby and want to have sex but need help getting and keeping an erection. These options can be bought without prescriptions, but you can also request prescription Viagra alternatives online from Superdrug Online Doctor without having a previous prescription. You can learn more about the side effects of Viagra online or read about them in the patient leaflet that comes with the medication.

You can choose Local Pharmacy Pickup before adding your order to your cart. Then, you will show your Blink card at the pharmacy counter to receive your prescription. If you know the name of the ED medication you are looking to purchase, you can search online or through the app on your Apple or Android device.

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