Swiss Navy Endurance Spray 15ml male desensitizer spray with lidocaine. Helps in temporarily the on set of ejaculation. Fast acting lidocaine formula. Endurance Rx with Lidocaine is a Male Desensitizer Spray that helps in temporarily slowing the onset of ejaculation. Product features: fast acting. 4 times stronger, as compared to many other desensitizers, pH balanced, non-irritating, last longer. Over 200 sprays. Swiss Navy Endurance Spray from M.D. Science Labs.