Does Praluent Cause Flu-Like Symptoms?
Praluent (alirocumab), a PCSK9 inhibitor for lowering cholesterol, lists flu-like symptoms—injection-site reactions, nasopharyngitis, influenza, and upper respiratory tract infections—as common side effects in clinical trials and prescribing information. These occur in 5-10% of patients, more often than placebo.[1][2]
What Flu-Like Symptoms Are Reported?
Patients report chills, fever, muscle aches, fatigue, headache, and sore throat shortly after injection. Nasopharyngitis (cold-like symptoms) affected 12.3% in the ODYSSEY trials versus 10.2% on placebo; influenza-like illness hit 7.2% versus 5.7%.[2][3] These mimic viral infections but stem from immune response to the monoclonal antibody.
How Common Are They and Who Gets Them?
Mild to moderate cases predominate, resolving in days without stopping treatment. Higher rates appear in first doses or dose escalations. Women and those with prior infections report more.[3] Severe reactions are rare (<1%).
How Long Do Symptoms Last?
Most start within hours of subcutaneous injection and fade in 1-3 days. Persistent cases may signal hypersensitivity; consult a doctor if fever exceeds 101°F or symptoms worsen.[1][2]
Why Do They Happen?
As a foreign protein, Praluent triggers cytokine release, causing transient inflammation akin to flu. Not a true infection—anti-drug antibodies develop in 4-20% but rarely neutralize efficacy.[3]
What Do Patients Say Online?
Forums like Drugs.com and Reddit note "post-shot flu" in 10-20% of reviews, often described as "achy and wiped out for a day." Many tolerate it; some switch to Repatha.[4]
How Does It Compare to Repatha?
Repatha's (evolocumab) profile mirrors Praluent: similar flu-like rates (5-8% nasopharyngitis, 6% URI). Head-to-head data show no clear winner; choice depends on insurance.[3][5]
Tips to Manage or Avoid
Inject at night, use acetaminophen preemptively, rotate sites, or try lower doses. Report to FDA if severe. No vaccine interactions noted.[1]
[1]: Praluent Prescribing Information (FDA)
[2]: ODYSSEY Clinical Trials Summary
[3]: Drugs.com - Praluent Side Effects
[4]: Patient reviews aggregated from Drugs.com and WebMD.
[5]: Repatha Prescribing Information (FDA)