And not all online pharmacies have the capability to safely ship medications that need to be temperature-controlled, such as insulin. On the other hand, if you are taking Cialis to treat BHP, you will be required to take a daily dosage to ensure there is a steady amount in your system. This increase in blood flow results in a firmer, longer-lasting erection. You will then be booked in for a virtual consultation that will work the same as a normal doctor’s consultation. On the other hand, Viagra only lasts four to five hours in the system and can only be taken once a day, so once the effects have worn off, you cannot use it again until 24 hours have passed.Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available . If you purchase them online — without a prescription — you won’t get a chance to discuss this with your doctor before you take them. ED drugs can also be dangerous if you have . How to take Cialis? Cialis is a prescribed medication. It is available at local pharmacies in the form of tablets. Your doctor will prescribe the medication depending on your .