Pro-Banthine (propantheline) side effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using propantheline and call your doctor at once if you have a serious side effect such as:
fast, pounding, or uneven heartbeats;
warmth, redness, or tingly feeling under your skin;
hot, dry skin with no sweating;
eye pain or redness, seeing halos around lights;
blurred vision and increased sensitivity to light;
confusion, agitation, extreme fear, hallucinations, unusual thoughts or behavior; or
urinating less than usual or not at all.