Vidalista 80 mg is an unusually high dose. The usual maximum recommended as-needed dose of tadalafil for erectile dysfunction is 20 mg in 24 hours. Taking 80 mg does not guarantee a stronger or longer-lasting erection and can increase the risk of side effects, including severe headache, dizziness, low blood pressure, and vision changes. Tadalafil can remain effective for up to 36 hours at recommended doses, but that doesn't mean you will have an erection continuously. Do not combine Vidalista with Cenforce/Viagra or nitrate medicines. If you've already taken 80 mg, don't take any more tadalafil; seek urgent medical advice, especially if you feel unwell. Chest pain, fainting, sudden vision or hearing loss, or an erection lasting over four hours requires emergency care.