Feminax Ultra Feminax Ultra provides long lasting relief from period pain & menstrual cramps in women aged between 15 & 50 years. It contains the active ingredient naproxen, a Non-Steroidal Anti-inflammatory Drug (NSAID) to target the cause of period pain
- the prostaglandins. Feminax Ultra was the first maximum strength naproxen pain reliever available in the UK without prescription & provides relief for up to 8 hours, so you can get those nights of uninterrupted sleep that previously seemed out of reach. Feminax Ultra are gastro-resistant tablets so are less likely to irritate your stomach.