<p>Antacids or Absorbent Antidiarrhoeals may reduce the absorption of propantheline bromide, therefore resulting in a reduction of its therapeutic effectiveness. Therefore, take two to three hours apart from doses of propantheline bromide. Anticholinergics may delay absorption of other medication given concomitantly. Significant drug interaction also occurs with concomitant use of digoxin, haloperidol, corticosteroides, ketoconazole, levodopa, opioid analgesics, phenothiazines, urinary alkalizers.</p>