Other Information: Each Caplet Cntains: Sodium 20 mg. Store at 20 degrees - 25 degrees c (68 degrees - 77 degrees f). Avoid high humidity and excessive heat above 40 degrees c (104 degrees f). See end flap for expiration date and lot number. Misc: Up to 12 hours of menstrual pain relief. www.flanaxusa.com. Questions or comments? Call 1-888-779-2877 M-F 9am-5pm EST.