I take triamterene for the water retention and swelling in my legs and have for several years, recently as of this week my feet and legs have been swelling and they are getting worse.

Call your doctor's office and tell the desk. This is pretty common as you age and your blood vessels have a harder time circulating blood back to your heart. Keep your feet up as much as possible while you wait to be seen.

Do you think the dosage needs to be adjusted?

Your entire health history, and current condition, will determine that.