If priapism is not treated immediately, penile tissue damage and permanent loss of potency may result. Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy NAION , a cause of decreased vision, including permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors. In some cases, ED can cause a strain on relationships and impact self-esteem. There are many safe, reliable online services offering ED prescriptions. Pharmacokinetics, half-life, is how long the medication stay s in the blood. These observations should be considered in clinical decisions when prescribing LEVITRA to patients with known history of QT prolongation or patients who are taking medications known to prolong the QT interval.Vardenafil HCl is a nearly colorless, solid substance with a molecular weight of g/mol and a solubility of mg/mL in water. LEVITRA is formulated as orange, round, film-coated tablets with “BAYER” cross debossed on one side and “”, “5”, “10”, and “20” on the other side corresponding to mg, 5 mg, 10 mg, and 20 mg of vardenafil, . 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. AdFree Shipping Available. Buy Dysfunction Erectile Products on ebay. Money Back Guarantee!Under $10 · >80% Items Are New · Buyer Protection Program · Daily DealsTypes: Learn More · Lubricants · Sexual Wellness.