Feminax Express Feminax Express offers fast, effective relief from period pain & menstrual cramps. It contains ibuprofen lysine, the lysine salt of ibuprofen which absorbs into your bloodstream twice as fast standard ibuprofen tablets to provide much needed relief from the unique pain a period brings. Ibuprofen is a non-steroidal anti-inflammatory drugs (NSAID), which works to reduce pain, fever & swelling, so can also be used to relieve rheumatic & muscular pain, back-ache, neuralgia (nerve pain), headache, migraine, dental pain, fever & the symptoms of colds & flu.