Stamina-Rx for Men: Stamina RX is a look alike of Viagra with blue and pill form. Stamina RX is the most potent natural sexual enhancer on the market. It is assumed that stimulates sexual desire, arousal and performance. Stamina RX contains only herbal extracts. This ensures that even if there is no significant impact, you need not worry about the side effects too. The product is ideally suited to those who seek easier methods to improve their sexual ability.