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Modula 5 mg is a medication that contains tadalafil as its active ingredient. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor, similar to sildenafil (found in Viagra) and vardenafil (found in Levitra). It is primarily used to treat erectile dysfunction (ED) in men. Tadalafil works by inhibiting the enzyme PDE5. Inhibition of PDE5 increases the levels of cyclic guanosine monophosphate (cGMP), a substance that promotes relaxation of smooth muscles in the blood vessels of the penis. This relaxation allows increased blood flow to the erectile tissues, facilitating an erection.