Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels. The typicaldose of Viagra is 50 mg. CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. You can take it at least 30 minutes before you want to have sex. Viagra Choosing the right ED pill can be intimidating. Cialis will be available by prescription only.Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. Patients should not use CIALIS if sex is inadvisable due to cardiovascular status ().Use of CIALIS with alpha-blockers, antihypertensives or substantial amounts of alcohol (≥5 units) may lead to hypotension (, ).CIALIS is not recommended in combination with alpha-blockers for the treatment of BPH because efficacy of the .  · There are many ways to buy Cialis in the Philippines. You can buy it at a brick-and- mortar pharmacy, online pharmacy, or even through a mail- order pharmacy. .