If you take nitrates in any form, or are on treatment for pulmonary hypertension , you should not take tadalafil. Cialis Dosage for Occasional Use For those of you who like to follow your heart, Cialis is also available to take as needed. Tadalafil, the active ingredient in Cialis, is also used to treat pulmonary arterial hypertension, a form of pulmonary hypertension in which blood pressure increases in the arteries that transport blood from your heart to your lungs. Pulmonary arterial hypertension can develop on its own or with other cardiovascular diseases, such as left heart disease LHD , sickle cell disease SCD and its variants, chronic obstructive pulmonary disease COPD and conditions such as pulmonary embolism PE. Taking tadalafil alone is not enough to cause an erection.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; Page; Blog. Blog; Blog Details; Contact Us; Get a quote. The most common side effects with Cialis are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours. Men who get back pain and muscle aches usually get it 12 to 24 hours after taking Cialis. Back pain and muscle aches usually go away within 2 days. Cialis Dosages. The most appropriate Cialis dose for you will depend on your needs, your healthcare provider’s assessment and how well you respond to the medication. Cialis is available in two forms: As a daily-use medication in dosages of mg and 5mg. For use as needed in dosages of 10mg and 20mg.