Taking more than this dose may lead to serious side effects such as dizziness or fainting; therefore it’s important to stick with the recommended dosage. Secondly, it’s important to take Megalis 20 MG at least 30 minutes prior to engaging in any physical activity so that it can take effect properly and provide you with optimal results. Finally, it’s best not to take more than one pill within 24 hours since this could potentially cause serious side effects.