To the Editor: An estimated 20 million men
worldwide have been prescribed sildenafil for erectile dysfunction, and there
is a growing market in "natural" alternatives.1 We
analyzed the chemical content of one such product, Actra-Rx, which has been advertised as "100% natural."2-6
Sabucedo AJ, Gutierrez MA, Mueller KC, et al. Sex, Lies, and Niagra. JAMA. 2004;291(5):560–562. doi:10.1001/jama.291.5.560-c
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