My Pharmacy offers many other erectile dysfunction treatments. Some of these erectile dysfunction treatments include. Take one Impotence tablet at least 30 minutes before sexual activity and may still be effective up to 36 hours after taking the tablet. Do not take tadalfil more than once a day. Tadalfil 10 mg and 20 mg is intended to be used prior to anticipated sexual activity and is not recommended for continuous daily use. Drinking alcohol may affect your ability to get an erection and may temporarily lower your blood pressure. If you have taken or are planning to take Tadalfil, avoid excessive drinking blood alcohol level of 0. Please note grapefruit juice may affect how well Tadalafil will work and should be taken with caution. Impotence to your doctor for further information. Most men occasionally fail to get or keep an erection.