How to take Cialis When taking Cialis, swallow one tablet whole with water, never split tablets or double up on your dosage. Cialis and Viagra are equally effective. This means a greater risk of side effects, so avoid grapefruit juice when taking Cialis. Therefore, physicians should inform patients that substantial consumption of alcohol e. Cialis is made by the pharmaceutical company Lilly. Who can legally supply Cialis in the UK?Cialis (tadalafil) is a popular medication used to treat erectile dysfunction. It’s available in tablets ranging from mg to 20mg. It can cost more than $ for a month’s supply, depending on the dosage you need and the pharmacy you visit. You can save more than 90% on the average retail price at certain pharmacies by using a GoodRx coupon. What is Cialis? Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). The drug comes in low-dose versions that can be taken daily. This means you can have sex at any time, rather than needing to take a pill from time to time as needed like other ED brands. The starting dose for daily-use Cialis is milligrams (mg). If that doesn’t work, you can increase your daily dose up to 5 mg.