You should seek immediate medical help after taking Malegra if you experience any severe or concerning side effects. These include chest pain, difficulty breathing, vision or hearing loss, irregular heartbeat, painful or prolonged erection (lasting more than 4 hours), seizures, or signs of an allergic reaction such as rash, itching, swelling (especially of the face, tongue, or throat), or severe dizziness. Additionally, if you feel extremely lightheaded, faint, or experience nausea during sexual activity, contact a doctor immediately. While mild side effects like headache, flushing, or nasal congestion may be normal, anything severe or persistent warrants prompt medical attention. Always follow prescribed doses.