Diurex water pill, contains an effective yet gentle diuretic that helps promptly increase the outflow of temporary excess body water, relieve monthly water weight gain, puffiness, bloat, swelling and pressure related cramps. Diurex Water Pills contain an effective pain reliever to help temporarily relieve menstrual associated pain and discomforts of cramps, spasms, backache, headache, muscular aches, breast tenderness, and pains due to overexertion, stress and strain.