Roth said: "Flomax is intended for a once-a-day intake. You have now or have had in the past, the medications you take. Tamsulosin relaxes the muscles in the prostate and bladder neck, making it easier to urinate. Tamsulosin is an alpha-blocker drug used to treat an enlargement of the prostate and bladder neck, making it easier to urinate. Try to take Flomax pills at the same time each day."