A 46-year-old man has been treated with venlafaxine extended-release 225 mg daily for 10 months for major depressive disorder and generalized anxiety disorder with good symptomatic response. Chart review shows a baseline blood pressure of 124/78 mm Hg before starting therapy. At today's visit his blood pressure is 148/94 mm Hg on repeat measurement, confirmed on home readings averaging 146/92 mm Hg over the past 2 weeks. He takes no other new medications and has no new symptoms. Which of the following is the most appropriate interpretation and next step?

Question

Accepted Answer

✅ D. Venlafaxine at doses above 150 mg daily can cause dose-dependent, sustained hypertension through increased norepinephrine reuptake inhibition; reduce the dose or switch to an alternative agent and recheck blood pressure
Venlafaxine is an SNRI whose noradrenergic activity increases in a dose-dependent fashion. At doses of 150 mg daily or more, clinically meaningful sustained elevations in blood pressure can develop — this is an FDA-labeled, well-documented adverse effect. This patient's blood pressure rose more than 20/15 mm Hg from baseline on a dose of 225 mg daily with no other explanation and now meets criteria for stage 2 hypertension. The appropriate response is to reduce the dose (if partial reduction maintains symptom control) or switch to a non-noradrenergic antidepressant (such as an SSRI) and reassess. Duloxetine can also raise blood pressure but generally less than venlafaxine.

❌ A. The elevated blood pressure is unrelated to venlafaxine; initiate lisinopril and continue the current dose
Adding an antihypertensive without addressing the drug-induced trigger treats only the symptom. Good practice identifies and removes (or mitigates) the offending agent first whenever feasible.

❌ B. Increase venlafaxine to 300 mg daily to improve depressive symptom coverage
Increasing the dose will worsen the dose-dependent hypertension — exactly the wrong direction.

❌ C. Order a 24-hour urine for metanephrines to rule out pheochromocytoma as the most likely cause
Pheochromocytoma is far less common than drug-induced hypertension and would typically present with episodic symptoms (headache, palpitations, diaphoresis). Starting with expensive rare-cause workup before addressing the known, more likely offender is not appropriate first-step management.

:::important
Venlafaxine dose-dependent hypertension: risk rises at 150 mg daily or more; incidence is higher at 225 to 375 mg. Check blood pressure at baseline and periodically on therapy. If sustained elevation develops, reduce the dose or switch agents before adding antihypertensive therapy. Duloxetine can also raise BP, generally less; bupropion and SSRIs are more BP-neutral options.
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