Ask your doctor if you have any questions. For CIALIS for use as needed, over and subjects were treated for at least 6 months and 1 year, respectively. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. Consideration should be given to the following: ED Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. If you have certain health conditions or are taking certain medications, your doctor may tell you to take tadalafil less often or may prescribe a lower dose to be taken once a day.Whichever condition Cialis is used to treat, the recommended maximum dose per day is 20 mg. This is the highest dosage that a doctor may prescribe. Dosage for erectile dysfunction (ED) For. Cialis (Tadalafil) online without a prescription, available in 40mg packs of 4 or 8 tablets to help you regain your confidence! All orders will be sent directly to your home in discreet packaging. Buy online today. Welcome to netbiz +8 () MENU. Home; Services; Page. About Us;. Price and dosage: Brand-name Cialis: $20 – $80 per dose (5mg, 10mg, 20mg) Generic Cialis (tadalafil): $11 – $44 per dose (5mg, 10mg, 20mg) Daily generic Cialis (tadalafil): $8 per dose.