The common side effects of Tadalafil are: Headache, indigestion, back pain, muscle aches, flushing, and a stuffy or runny nose. Some of the potential side effects of Enclomiphene include: Headache, visual disturbances, nausea, diarrhea, hot flashes, breast tenderness, joint pain, dizziness, acne, aggression, and irritability. For a full list of possible side effects see the important safety information on the product page.