<p>Methylphenidate may increase the effects of imipramine. This is usually avoided by reducing the dosage of imipramine. Imipramine may increase the depressant action of alcohol. Dangerously high blood pressure has resulted from the combination of imipramine, and members of monoamine oxidase (MAO) inhibitors. Because of this, imipramine should never be taken in combination with MAO inhibitors. Patients taking any MAO inhibitors, for example phenelzine sulfate or tranylcypromine sulfate, should stop the MAO inhibitor then wait at least 14 days before starting imipramine or any other tricyclic antidepressant. The same holds true when discontinuing imipramine and starting an MAO inhibitor. The anticholinergic (drying out) effects of imipramine are additive with other anticholinergic drugs such as benztropine, biperiden, trihexyphenidyl, and antihistamines.</p>