Common side effects of Tadora 20 mg may include headache, flushing, nasal congestion, indigestion, dizziness, and back pain. Serious side effects such as sudden vision loss or hearing loss are rare but possible and should be reported to a doctor immediately.The dosage and frequency of Tadora 20 mg should be determined by a healthcare professional based on individual needs and medical history. It's essential to follow the prescribed dosage and instructions carefully.