Can you legally buy Cialis online? Yes, it is legal to purchase Cialis online. However, people should only use reputable telehealth companies and online pharmacies.Depending on your specific circumstances, your doctor may want you to: stop taking one of the medications, change one of the medications to another, change how you are taking one or both of the medications, or leave everything as is. CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. The active ingredient can remain longer if you have problems with your kidneys or liver, or you are taking certain other medications. Brand-name versions of the drug approved for PAH include Adcirca. Daily doses are often between 2.Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your individual plan. 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. Low libido (reduced sex drive) can strike men at any age, but it becomes more common as a man gets older. It may be caused by: psychological factors, such as child abuse, depression, or relationship issues. physical factors, such as low testosterone or medication side effects (such as antidepressants, oral medications used to treat prostate.One of these is PAH. This may lead to dizziness or fainting. Emling S. Viagra generally only stays in your system for four to six hours. Alcohol: Consumption of alcohol may decrease the ability to achieve an erection and may also temporarily decrease blood pressure, causing dizziness and fainting.