cheap generic levitra But to Callanan, the fake is obvious. “I see this one all the time,” she says, handing me one of the boxes. It’s the same type Hitsman sold. “This is the most common counterfeit Viagra we see—it’s manufactured for the Malaysian market.” She points out the telltale signs of the fake: the blue stripe is too dark, the word “contains” is spelled incorrectly (“contaihs”), and the box sports a hologram that Pfizer no longer uses. But the giveaway is the lot number: 314833021, which Callanan rattles off from memory. Once a lot has been distributed to patients, Pfizer permanently retires its number. But thanks to counterfeiters, this lot number still lives on in knockoffs. It’s proven so popular among criminals that Callanan now sees knockoffs of the knockoffs. “It’s interesting how these same mistakes get perpetuated,” she says.Administration of Levitra with nitrates (either regularly and/or intermittently) and nitric oxide donors is contraindicated [see Clinical Pharmacology (12.2)]. Consistent with the effects of PDE5 inhibition on the nitric oxide/cyclic guanosine monophosphate pathway, PDE5 inhibitors, including Levitra, may potentiate the hypotensive effects of nitrates. A suitable time interval following dosing of Levitra for the safe administration of nitrates or nitric oxide donors has not been determined.
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