Tadarise Black 80 mg (Tadalafil) — what it is, how it works, common side effects, precautions, etc. Always follow medical advice and check with a qualified professional before using. Serious side effects (less common) include: Priapism (prolonged erection) — medical emergency if it lasts more than 4 hours. Arrowmeds Vision changes, hearing problems Arrowmeds Sudden drop in blood pressure, especially if used with nitrates or in people with heart disease. You must not take it along with nitrates (for chest pain) — that combination can cause a dangerous drop in blood pressure. Arrowmeds Be cautious with other medications that interact (for example certain antifungals, HIV drugs, other ED medications) — tell your doctor about all you are taking. Erectile Novus +1 Avoid excessive alcohol, grapefruit or grapefruit juice, as they may increase side effects. Arrowmeds +1 Not for use in women, children, or adolescents under 18.