Which combination should be avoided due to contraindication with nortriptyline?

• A. Nortriptyline with MAOI
• B. Nortriptyline with Beta-Blocker
• C. Nortriptyline with Acetaminophen
• D. Nortriptyline with Vitamin C

Answer: (A)

Combining a tricyclic antidepressant with a monoamine oxidase inhibitor is dangerous because both raise brain monoamines, and together they can surge to harmful levels. Nortriptyline blocks reuptake of norepinephrine and serotonin, increasing their presence in the synapse, while MAOIs prevent the breakdown of these monoamines. The result can be a hypertensive crisis or serotonin syndrome, which are potentially life-threatening. Because of this, the pairing is contraindicated and should be avoided; if a switch is needed, a supervised washout period is required.

Other common combinations with nortriptyline, like acetaminophen or vitamin C, are generally safe, though any new medication should be reviewed by a clinician. A beta-blocker may be used with caution, with monitoring for added effects on heart rate or blood pressure.