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This medication works by blocking the chemical PDE5. This chemical is responsible for the blockage of blood to flow through the penis - causing the muscles in the penis to constrict. As PDE5 is blocked, the blood is then allowed to stay longer in the penis, causing it to maintain an erection. The more blood flowing in the penis means erection can be achieved.Sometimes they are serious, most of the time they are not. You may need medical attention if you get some of the side effects. viagra contraindications Your doctor will review your complete medical history before writing a prescription for Viagra to treat male impotence. Viagra is not suitable for all patients. You should not take Viagra if you have certain cardiovascular conditions, including high blood pressure. Patients with kidney problems, liver damage, sickle cell anemia, bleeding disorders, leukemia, or multiple myeloma may not be able to take Viagra. Tell your doctor if you have any of these conditions.

Sildenafil, vardenafil, and tadalafil do not directly cause an erection of the penis, but they alter the body's response to sexual stimulation by enhancing the effect of the nitric oxide, a chemical that is normally released during stimulation. Nitric oxide causes relaxation of the muscles in the penis, which allows for better blood flow to the penile area.

In vivo studies best online pharmacy Pharmacokinetics in Special Populations slow or fast heartbeatrarely men have lost eyesight sometime after taking drugs to treat erectile dysfunction (known as impotence). If you lose eyesight in one or both eyes or experience changes in vision such as blurring, a blue colour to your vision or a greater awareness of light, seek medical attention urgently a Treatment duration in Study F was 6 months

Musculoskeletal: increase in creatine phosphokinase (CPK), increased muscle tone and cramping, myalgiaThe emergency contraceptive pill Plan B had a bumpy road to over-the-counter status after Health and Human Services Secretary Kathleen Sebelius overruled the FDA’s recommendation that it be sold on pharmacy shelves to everyone in 2011. cialis 5mg review

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