The body takes longer to absorb it after a high-fat meal or alcohol. In vivo studies: Cytochrome P Inhibitors Cimetidine mg b. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors. Consequently, it is recommended not to exceed a single 2. Erectile dysfunction medications require a prescription from a licensed provider. Safety of combined use of PDE5 inhibitors and alpha-blockers may be affected by other variables, including intravascular volume depletion and other anti-hypertensive drugs.Possible reactions include: a potentially dangerous drop in blood pressure, or hypotension. dizziness. fainting. There is also a risk of stroke and heart attack. A man should not use vardenafil if. Brand name: $ to $1, for ten to thirty 10 mg tablets. Generic: $ to $ for ten 10 mg tablets. But your out-of-pocket cost for Levitra may depend on a few different factors that can drop. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list its phone number and physical address, has prices that seem too good to be true, or tells you that no prescription is needed.