Penegra 50 mg tablet is the one that is prescribed for you by a doctor and taken exactly as directed. Penegra 50 mg contains sildenafil, and it should not be used with nitrates or riociguat because that combination can cause a dangerous drop in blood pressure. What makes it safer Use it only if you have been checked for heart, blood pressure, liver, and kidney problems. Avoid alcohol while taking it, since that can increase side effects like dizziness. Do not take more than once in 24 hours. The usual starting dose for Penegra 50 mg , but a doctor may adjust it based on tolerance and response. When to avoid it If you take nitrate medicines for chest pain. If you take riociguat. If you have severe liver disease, or recent serious heart problems, unless a doctor specifically approves it. Practical answer If you are choosing between brands or sellers, the safest choice is a genuine, doctor-prescribed, sealed product from a licensed pharmacy rather than an unverified online source. If you mean whether Penegra 50 mg itself is safe for you, the answer depends on your current medicines and medical history.