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Nandrolone phenylpropionate (NPP), or nandrolone phenpropionate, sold under the brand name Durabolin among others, is an androgen and anabolic steroid (AAS) medication which has been used primarily in the treatment of breast cancer and osteoporosis in women. It is given by injection into muscle once every week. Although it was widely used in the past, the drug has mostly been discontinued and hence is now mostly no longer available.

Side Effect:

The most common side effects of NPP consist of virilization (masculinization) in women, including symptoms such as acne, hirsutism (increased body/facial hair growth), hoarseness of the voice, and voice deepening. However, relative to most other AAS, NPP has a greatly reduced propensity for virilization and such side effects are relatively uncommon at recommended dosages. At higher dosages and/or with long-term treatment they make increase in incidence and magnitude however. A variety of uncommon and rare side effects may also occur.

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