system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Tadalafil should not be given with:
assistant
The correct answer is  Ref. KDT. Page. 190
TALADAFIL:

More potent and longer acting congener of sildenafil
t1⁄2 18 hours and duration of action 24–36 hours.
Acts faster
Side effects, risks, contraindications and drug interactions are similar to sildenafil.
Because of its longer lasting action, nitrates are contraindicated for 36–48 hours after tadalafil.  (vasodilators)