Maxidol Liquid Gels with Naproxen Sodium provides up to 12 hours of effective pain relief to help you feel better and stay active during your menstrual cycle. Available in convenient and easy to take liquid filled capsules, Maxidol contains naproxen sodium which provides effective relief of pain such as menstrual cramps, headaches, backache, migraine pain and muscle pain for up to 12 hours.