Abrupt Lisinopril Discontinuation Does NOT Cause Rebound Tachycardia
Abruptly stopping lisinopril does not cause tachycardia or rebound hypertension. The FDA drug label explicitly states that "abrupt withdrawal of lisinopril has not been associated with a rapid increase in blood pressure, or a significant increase in blood pressure compared to pretreatment levels" 1. Furthermore, the pharmacodynamic profile shows that lisinopril administration results in blood pressure reduction "with no compensatory tachycardia" 1.
Why Lisinopril is Different from Other Antihypertensives
The 2025 AHA/ACC guidelines clearly distinguish ACE inhibitors from medications that DO cause withdrawal syndromes. The guidelines specifically warn that "abrupt pre-operative discontinuation of BB [beta-blockers] or clonidine may result in rebound hypertension and is potentially harmful," but make no such warning for ACE inhibitors like lisinopril 2. In fact, the guidelines note that discontinuation of ACE inhibitors or ARBs may even be considered perioperatively to prevent hypotension 2.
What the Evidence Shows About ACE Inhibitor Withdrawal
Research confirms this distinction. A 2005 review on antihypertensive withdrawal syndrome found that withdrawal reactions occur "mostly with clonidine, beta-blockers, methyldopa and guanabenz" - notably excluding ACE inhibitors 3. A 1998 study examining ACE inhibitor discontinuation showed that blood pressure rises within 48 hours after stopping the medication, but this represents a return toward baseline rather than rebound hypertension, and was not accompanied by tachycardia 4.
Your Patient's Tachycardia Has Another Cause
With a heart rate of 120 bpm and blood pressure of 120/89 mmHg, you need to look for alternative explanations:
- Pain or anxiety - common causes of sympathetic activation
- Volume depletion - the blood pressure is relatively normal but tachycardia suggests compensatory response
- Infection or fever - check for systemic illness
- Thyroid dysfunction - particularly if this is new-onset tachycardia
- Medication effects - review other medications that could cause tachycardia
- Cardiac arrhythmia - obtain ECG to rule out atrial fibrillation or other arrhythmias
- Withdrawal from other medications - particularly if the patient was on beta-blockers or clonidine
Critical Clinical Pitfall
Do not attribute tachycardia to lisinopril discontinuation and miss the actual underlying cause. The blood pressure of 120/89 mmHg is not consistent with a hypertensive crisis or rebound phenomenon. The tachycardia requires investigation for its true etiology, which could represent a serious underlying condition requiring immediate attention.