Ramipril, a widely prescribed medication for high blood pressure, heart failure and stroke prevention, may cause a rare but serious side effect: sudden swelling of the lips or tongue, known as angioedema. Pharmacist Raj R Patel has emphasised that this reaction can happen at any time during treatment, even if a patient has been using ramipril safely for years.
An estimated six million people in the UK are taking ramipril, with over 35 million prescriptions dispensed annually. While common side effects include cough, headache and nausea, Patel highlighted in a TikTok video that angioedema is less well known but potentially dangerous.
“Angioedema involves rapid swelling beneath the skin or tissues, especially around the lips, tongue, mouth or throat,” Patel explained. “This can interfere with breathing and requires urgent medical attention.”
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He noted that cases of delayed angioedema are well documented in the UK, including incidents occurring after five years of uneventful ramipril use. Although the reaction is rare, awareness is vital because swelling near the airway can be life-threatening.
The NHS advises anyone experiencing sudden swelling of the lips, mouth, tongue or throat-particularly if breathing or swallowing becomes difficult-to call 999 immediately. This reaction is distinct from the more familiar dry, tickly cough often caused by ramipril, although both stem from the medication’s effect on the angiotensin-converting enzyme (ACE).
Patel explained the underlying mechanism: “Ramipril blocks ACE, an enzyme that normally breaks down bradykinin, a molecule involved in dilating blood vessels. When bradykinin accumulates in susceptible individuals, it can lead to the swelling seen in angioedema. Importantly, this side effect doesn’t present like a typical allergic rash and should not be ignored or monitored without medical advice.”
UK prescribing guidelines recommend stopping ramipril and seeking emergency treatment if angioedema is suspected. Patients should not take further doses until assessed by a healthcare professional.
Aside from angioedema, common side effects listed by the NHS include dizziness, headache, and cough, while less common reactions may warrant consulting a doctor or dialling 111. In the event of severe allergic reactions such as anaphylaxis, urgent hospital care is necessary.
Patel’s warning serves as an important reminder to patients and healthcare providers to remain vigilant for this uncommon but serious ramipril side effect, ensuring prompt treatment to prevent complications.