Tadalafil can be taken just before engaging in sexual intercourse without thinking about exactly when to do so. Tadalafil is mainly indicated for the treatment of penile erectile dysfunction. Taking Tadalafil tablets improves the patient’s erectile function within 36 hours, so there is no need to think about when to have sex; it is sufficient to take it before having sex. Taking tadalafil tablets is not affected by eating, but you need to take the whole tablet, and you need to be careful not to overdose by taking it up to once a day. Tadalafil is strictly prohibited for users of nitrates. Side effects of tadalafil include eye pain, conjunctival congestion or eyelid swelling, etc. If a patient occasionally experiences discomfort such as eye pain, conjunctival congestion or eyelid swelling after taking the medication, he or she should stop taking the medication and seek medical examination as soon as possible. The medication should be applied under the supervision of a doctor.