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Unfortunately, these medications can also affect blood flow in arteries in other parts of the body, producing serious, unwanted side effects. For instance, in addition to inhibiting the enzyme PDE-5, Viagra-like medications can also inhibit the enzyme PDE-6. This other enzyme functions in the photoreceptors in the eyes; the result is light sensitivity or blue-tinged vision.
In addition to this vision-related side effect Levitra, Cialis, and Viagra can also cause other side effects, including:
§ Facial Flushing
§ Pulmonary Hypertension
§ Nasal Congestion
§ Gastrointestinal Problems
These side effects can have serious medical consequences, and they occur in about 3% of men who take 25 – 50 mg, 50% of men who take 200 mg, and a staggering 100% of men taking 600 – 800 mg of the drugs.