In a solution of sodium bicarbonate it is impossible to dissolve acidic substances (ascorbic, nicotinic and other acids), alkaloids (atropine, apomorphine, caffeine, theobromine, papaverine and etc.), cardiac glycosides, salts of calcium, magnesium, heavy metals (iron, copper, zinc), t. precipitation occurs, or hydrolysis of organic compounds. Do not mix with phosphate-containing solutions. May enhance the effect of antihypertensive drugs.