Does Entresto Cause Allergic Reactions?
Yes, Entresto (sacubitril/valsartan) can cause allergic reactions or sensitivities, though they are uncommon. The prescribing information lists hypersensitivity reactions as a potential adverse event, including symptoms like angioedema (swelling of the face, lips, tongue, or throat), rash, urticaria (hives), and itching. These may occur soon after starting treatment or during ongoing use. Severe cases can involve difficulty breathing or swallowing, requiring immediate medical attention.[1]
Common Signs of Allergic Reactions to Entresto
Patients report:
- Skin reactions: Rash, hives, or redness.
- Swelling: Especially in the face, extremities, or airways (angioedema risk is higher in those with prior ACE inhibitor use).
- Other: Itching, nausea, or dizziness linked to sensitivity.
In clinical trials, hypersensitivity occurred in about 0.5% of patients, compared to 0.3% on valsartan alone.[1][2]
Why Does This Happen with Entresto?
Entresto combines sacubitril (a neprilysin inhibitor) and valsartan (an ARB). The sacubitril component increases bradykinin levels, which can trigger angioedema similar to ACE inhibitors. Those with a history of angio inhibitor allergies face higher risk—Entresto is contraindicated in such cases. Cross-sensitivity with other ARBs is less common but possible.[1][3]
What If You Have a History of Allergies?
Avoid Entresto if you've had angioedema from ACE inhibitors or ARBs. Inform your doctor of any drug allergies, asthma, or immune conditions beforehand. Monitoring starts with low doses; discontinue if swelling or rash appears. EpiPens may be prescribed for at-risk patients.[1]
How Often Do Reactions Occur Compared to Similar Drugs?
| Drug | Hypersensitivity Rate | Angioedema Risk |
|------|-----------------------|-----------------|
| Entresto | ~0.5% | Elevated (due to sacubitril) |
| Lisinopril (ACEi) | 0.1-0.7% | Higher (3-5x vs. ARBs) |
| Losartan (ARB) | <0.1% | Low |
Reactions are rare overall but more frequent than placebo. Post-marketing reports note rare anaphylaxis.[1][4]
What Should You Do If a Reaction Happens?
Stop the drug and seek emergency care for swelling or breathing issues. Mild rashes may resolve with antihistamines, but consult a doctor. Report to FDA MedWatch for tracking.[1]
[1]: Entresto Prescribing Information (Novartis)
[2]: PARADIGM-HF Trial Data (NEJM)
[3]: FDA Label Warnings
[4]: Drugs.com Side Effects Database