Sexual activity may be a strain on your heart, especially if you have heart disease. Tadalafil is also sometimes taken once a day every day without regard to timing of sexual activity. However, because sexual stimulation is required to initiate the local penile release of nitric oxide, tadalafil’s inhibition of PDE5 will have no effect without sexual stimulation. If you become pregnant while taking tadalafil, call your doctor. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. 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. This increased blood flow can cause an erection.AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping AvailableFree Shipping · Real Doctors · Personalized Plan · Discreet Packaging/5 (3, reviews). In clinical studies, people who took the 20 mg dose of tadalafil (Cialis) experienced an average drop in blood pressure by about 2 mm Hg. Most people won’t experience any noticeable symptoms from this blood pressure change. (Cialis) images. This medicine is Yellow, Round Tablet Imprinted With “” And “Teva”. Yellow Round . Best prices for generic cialis on the Internet! The safest way is to ask your physician to try an alternate prescription. Detailed dosage guidelines and administration information for Cialis (tadalafil). Includes dose adjustments, warnings and .