I take triam/hctz 37.5/25 mg can i take magnesium supplements 54 year female?

Yes: It is very safe and even a good idea to take magnesium supplements with this medicine. Triamterene/hctz is known to sometimes cause magnesium deficiency. The best absorbed forms tend to be magnesium glycinate & taurate; citrate is pretty good too. Too much magnesium can have a laxative effect- this could potentially cause electrolyte imbalances so do not use it for a laxative effect.