The FDA's approval of Viagra (Sildenafil) on March 27, 1998 was a ground-breaking commercial event for the treatment of ED, with sales exceeding US$1 billion. Subsequently, the FDA approved Levitra (vardenafil) on August 19, 2003, and Cialis (tadalafil) on November 21, 2003. viagera One of the less common side effects associated with Viagra is a medical emergency known as priapism. Priapism is a painful erection lasting for more than four hours which requires immediate medical attention and treatment. Priapism may lead to permanent damage if left untreated, including the permanent loss of ability to have an erection. Levitra acts similarly to Viagra regarding possible side effects and onset and duration of pharmacologic action. However, Levitra is available at a lower dose and commonly causes dizziness. The typical recommended starting dose of Levitra is 10 mg and dosages can range from 5 mg to 20 mg depending on desired response and adverse reactions. Cialis differs from both Viagra and Levitra with regard to onset and duration of action. With treatment with Cialis, improvement in erectile function is possible for anywhere from 24 to 36 hours after administration of a dose, significantly longer than with Viagra. In addition, Cialis typically has a quicker onset of action and begins to work within approximately 30 minutes. Similar to Levitra, the recommended starting dose for Cialis, as needed, is 10 mg. Doses may range from 5 mg to 20 mg depending on efficacy and patient tolerability.
83491133 NDC 0173-0831-13 buying cialis in canada Keep Cialis and all medicines out of the reach of children.Regardless of who is picking up the tab, an additional problem with Cialis for daily use is compliance. Yes, sex and sexual health can be powerful motivators, but so should the risk of a heart attack, or a stroke, or the malaise that comes with poorly controlled diabetes. And yet study after study shows that people have a hard time (logistically or financially) consistently taking drugs that are essential to their health. So why should this be any different? In this case, miss a few pills and your Cialis blood levels fall below the therapeutic range: You may not be ready, and as a physician friend of mine quipped, it could be several months before the stars realign and the opportunity presents itself again.
Important: if your erection lasts for longer than four hours, or if you get chest pains or a sudden loss of vision, contact a doctor for medical attention straightaway. pfizer viagra free samples abdominal or stomach pain
Immediately telephone your doctor or the Australian Poisons Information Centre (telephone 13 11 26) or the New Zealand National Poisons Centre (0800 POISON or 0800 764 766), or go to Accident and Emergency at the nearest hospital, if you think that you or anyone else may have taken too much CIALIS.Cialis? (See-AL-iss)
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What should I avoid while taking Levitra? Moreover, tadalafil was approved in May 2009 in the United States for the treatment of pulmonary arterial hypertension  and is under regulatory review in other regions for this condition. In late November 2008, Eli Lilly sold the exclusive rights to commercialize tadalafil for pulmonary arterial hypertension in the United States to United Therapeutics for an upfront payment of $150 million.Prev page:how to buy viagra online