Vidalista 2.5 mg, which contains tadalafil, can cause some side effects that require medical attention. Serious side effects include priapism (a painful, prolonged erection lasting more than 4 hours), sudden vision or hearing loss, chest pain, irregular heartbeat, shortness of breath, and swelling in the hands, ankles, or feet. Severe dizziness, fainting, or an allergic reaction (e.g., rash, itching, swelling) also require immediate medical intervention. If any of these symptoms occur, it's crucial to seek emergency medical help. Additionally, individuals with a history of heart problems or using nitrate medications should avoid Vidalista. Always consult a healthcare provider if uncertain.