Evigrade
Moderate

Amitriptyline × Losartan

Tricyclic antidepressants (TCA)×Angiotensin II receptor blockers (sartans)

Mechanism

Additive orthostatic hypotension. Losartan (ARB) dilates vessels; amitriptyline blocks α1-adrenoceptors. Older patients: fall risk.

Symptoms

Postural dizziness, syncope, fatigue. Older patients: fall and fracture risk.

Management

In older patients, check standing and sitting blood pressure 1–2 weeks after starting amitriptyline. For neuropathic pain, alternative: gabapentin or pregabalin.

Sources

All interactions