Can Viagra cause priapism and low libido?

Thanks for the query Viagra is SILDENAFIL which is chemically a Phosphodiesterase 5 inhibitor. This cause dilatation of arteries specifically in penis and lungs. Side effect is visual halos, blood pressure dropping and headache. This medicine is also used in Pulmonary Hypertension. Once serious side effect is dropping of blood pressure if combined with a nitrate, the medicine used to treat angina. These 2 medicines should never be overlapped in 24 hours at least. SILDENAFIL is safe and effective. No other serious side effect. No direct effect on libido but indirectly is can boost libido due to confidence. Dose should be minimized. Regards

Thanks for the follow-up sir Priapism is an emergency and it can cause serious damage to penis if not treated within 4 hours. Continuous dilatation of penile arteries causes constriction of penile veins and blood flow may cease thus leading to serious damage. This is rare if drug is not overdosed. If you have done damage to your penile tissue, it would have caused severe penile pain and swelling and later may develop necrosis/gangrene. So, you would have known this. As I mentioned, common side effects are headache and visual changes. Dropping of blood pressure is serious if taken with nitrates. Regards

Thanks for the follow-up sir If you can have erections without pain it means penile tissue is safe / healthy. No, there is no damage, don't worry sir. Regards