If Tadarise 5 mg contains tadalafil 5 mg, there is no fixed treatment duration for erectile dysfunction (ED). When prescribed for daily ED treatment, 5 mg may be taken once daily for as long as it remains appropriate and effective, with periodic medical review. Daily ED use: 2.5 mg is the usual starting dose, which may be increased to 5 mg once daily based on effectiveness and tolerability. Effect: tadalafil can remain effective for up to about 36 hours after an as-needed dose. Long-term use: the appropriate duration depends on your health, other medicines, side effects, and whether the underlying ED needs further evaluation. Important: tadalafil should not be used with nitrates because of the risk of a dangerous drop in blood pressure. If you mean how long Tadarise 5 mg should be taken before reassessing whether it is working, I can explain that specifically.