A selective inhibitor of cyclic guanosine monophosphate  (cGMP) – specific phosphodiesterase type 5 – tadalafil has the following structural formula:

Tadafil is a crystalline substance insoluble in water and practically insoluble in ethanol. Tadalafil is chemically designed as pyrazino[1,2:1.6]pyrido[3.4-b]indole-1.4-dione, 6-(1.3-benzodioxol – 5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-, (6R,12aR)-.

Cialis is produced in form of tablets containing tadalafil in 2.5, 5, 10 and 20 mg. The other inactive components of the drug are: croscarmellose sodium, hydroxypropyl cellulose, hypromellose, iron oxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose, sodium lauryl sulfate, titanium dioxide, talc and triacetin. If you have allergy to any component of the drug, you should consult your doctor to define the possible risk of allergic reactions.

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