Contact your medical provider if you experience any side effects during treatment. John’s wort. You may attempt sexual activity at any time between doses. This leads to shortness of breath when exercising or completing regular daily activities. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax.Cialis is a PDE5 inhibitor, a drug designed to treat erectile dysfunction (ED). It is a selective inhibitor of cyclic monosphosphate (cGMP)-specific phosphodiesterase type 5. Cialis .  · The most promising supplement for boosting testosterone, according to Dr. Desai, is ashwagandha. A study in the American Journal of Men’s Health examined overweight men, ages 40 to 70, with.  · The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual Cialis dose is 10 mg (with a maximum daily dose of 20 mg). The typical dose of.