Pamabrom is a common over-the-counter mild diuretic that is often used in combination with acetaminophen and other drugs for the treatment of menstrual pain. It consists of a 1:1 ratio mixture of 8-bromotheophylline and 2-amino-2-methyl-1-propanol. A bioanalytical method for pamabrom, determined as 8-bromotheophylline, was developed and validated using reverse-phase HPLC coupled with UV detection.