<ul>
	<li>Promethazine Hydrochloride may enhance the action of any anticholinergic agent, tricyclic antidepressant, sedative or hypnotic, Alcohol should be avoided during drug treatment.</li>
	<li>Phenergan may interfere with immunologic urine pregnancy tests to produce false-positive or false-negative results.</li>
	<li>Phenergan should be discontinued at least 72 hours before the start of skin tests using allergen extracts as it may inhibit the cutaneous histamine response thus producing false-negative results.</li>
</ul>