Did a little research...
Here's the scoop.
The following drugs may increase the effects of potassium salts (acetate, bicarbonate, and citrate) so it's important not to take these if you are on any of the following meds, without talking to the doctor:
Most ACE inhibitors, and as we already noted, potassium-sparing diuretics such as triamterene (Dyrenium, Dyazide, Maxzide), spironolactone (Aldactone, Aldactazide), and amiloride (Midamor, Moduretic);
And yes, beta-blockers such as atenolol (Tenormin) and propranolol (Inderal); including acebutolol (Sectral), bisoprolol (Zebeta), carteolol (Cartrol), labetalol (Normodyne, Trandate), nadolol (Corgard), metoprolol (Lopressor), and pindolol (Visken).
ALSO, talk to the doc if you take the heart medicine digoxin (Lanoxin);
or steroids such as prednisone (Deltasone, Orasone,) cortisone (Cortone), hydrocortisone (Cortef, Hydrocortone), dexamethasone (Decadron, Hexadrol).
OR an anti-inflammatory drug such as ibuprofen (Motrin, Advil, others), naproxen (Aleve, Anaprox, Naprosyn,), or ketoprofen (Orudis KT, Orudis, Oruvail). These may also interact with potassium salts.
Jeesh, guess it's best if you are on ANYTHING(!) to double check with your physician before using potassium salt-substitutes!