Udenafil

Udenafil is a selective reversible inhibitor of cyclic guanosine monophosphate (cGMP), a specific type 5 phosphodiesterase (PDE-5).
Udenafil does not have a direct relaxing effect on an isolated cavernous body, but upon sexual stimulation enhances the relaxing effect of nitric oxide by inhibiting PDE-5, which is responsible for the breakdown of cGMP in the cavernous body. The consequence of this is relaxation of the smooth muscles of the arteries and blood flow to the tissues of the penis, which causes an erection.
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Dosage

The drug is taken orally, regardless of food intake
The recommended dose of the drug is 100 mg, taken 30 minutes before the alleged sexual activity.
The dose can be increased to 200 mg, taking into account the individual effectiveness and tolerability of the drug. Maximum recommended frequency of use – once a day

Side effects

From the side of the organ of vision: often – redness of the eyes.
On the part of the skin: sometimes – swelling of the eyelids, face, urticaria.
From the digestive system: often – dyspepsia, discomfort in the abdomen.
From the respiratory system: often – nasal congestion; sometimes – shortness of breath, dry nose.
The body as a whole: often – headache, chest discomfort, sensation of heat; sometimes – chest pain, abdominal pain, fatigue, thirst.