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| Other names | Methisosildenafil; Dimethyl sildenafil | 
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| Formula | C23H32N6O4S | 
| Molar mass | 488.61 g·mol−1 | 
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Aildenafil (methisosildenafil) is a synthetic drug that is a structural analog of sildenafil (Viagra). [1] It was first reported in 2003. [2] Like sildenafil, aildenafil is a phosphodiesterase type 5 inhibitor.
Aildenafil has been found as an adulterant in a variety of supplements which are sold as "natural" or "herbal" sexual enhancement products. [3] [4] [5] [6] [7] The United States Food and Drug Administration has warned consumers that any sexual enhancement product that claims to work as well as prescription products is likely to contain such a contaminant. [8]
Aildenafil is approved for use in China. [9]