What Medications Are Linked to Bullous Pemphigoid?

Yes, certain diabetes and cardiovascular medications are associated with an increased risk of developing bullous pemphigoid ^[1]. This is often referred to as drug-associated or drug-induced bullous pemphigoid. In these cases, a medication is suspected of triggering the immune system to mistakenly attack the tissue just beneath the top layer of skin, leading to blistering.

While the overall absolute risk of developing bullous pemphigoid from these drugs is very low, observational studies have found strong associations with specific classes of medications, particularly DPP-4 inhibitors (used for diabetes) and certain diuretics (used for fluid retention and blood pressure) ^[2][1]. However, because many patients take these medications without ever developing the disease, an association does not definitively prove that the drug caused the blistering in any individual person.

Urgent Warning Signs

If you develop new blistering after starting a medication, do not assume it is bullous pemphigoid. Severe drug reactions can be medical emergencies. Seek immediate medical attention if you experience rapidly spreading or painful blisters, skin peeling, fever, facial swelling, sores in your mouth or eyes, difficulty breathing, or signs of infection (like pus or worsening redness).

Diabetes Medications (DPP-4 Inhibitors)

The strongest reported medication association for bullous pemphigoid involves a class of type 2 diabetes medications called DPP-4 inhibitors, also known as “gliptins” ^[2][3]. Observational studies suggest that not all gliptins carry the same level of risk. Some data points to a stronger association with vildagliptin and linagliptin, while the evidence for others like sitagliptin is less consistent ^[4][5].

Importantly, blistering may not start immediately. The time between starting a gliptin and developing symptoms can range from just a few weeks to several years ^[6][7]. Because of this long delay, it is easy to miss the connection between a medication you have taken safely for years and a sudden outbreak of blisters.

Diuretics and Other Cardiovascular Medicines

Certain medications used to manage fluid overload, heart failure, and high blood pressure are also associated with bullous pemphigoid. Loop diuretics, such as furosemide, have been identified as potential triggers ^[1][8]. Other diuretics, including thiazides and potassium-sparing diuretics like spironolactone, have also been reported in case studies, though the strength of the evidence is not as well-quantified as it is for DPP-4 inhibitors ^[9][10].

Other Potential Medication Associations

Researchers have identified other medications that may trigger bullous pemphigoid, though the strength of the evidence varies:

• Immune checkpoint inhibitors (PD-1/PD-L1 inhibitors): A type of cancer immunotherapy that has a strong established link. These can cause blistering even months after the treatment has stopped ^[1][11].
• Antibiotics and other drugs: Penicillin derivatives, ACE inhibitors (for blood pressure), and levetiracetam (for seizures) have been reported as potential triggers in some studies, but further research is needed to confirm these links ^[1][12].

How Doctors Confirm the Diagnosis

Your doctor cannot diagnose drug-associated bullous pemphigoid just by looking at your medication list. Diagnosis typically involves a physical examination and a skin biopsy, where a small sample of a blister and the surrounding skin is tested using direct immunofluorescence to look for specific immune deposits ^[1].

Differences in Symptoms

Drug-associated bullous pemphigoid often looks clinically identical to idiopathic bullous pemphigoid (disease that occurs without a known cause or medication link) ^[1]. However, there can be subtle differences. For example, some studies suggest that cases associated with gliptins may present with less severe inflammation, less redness (erythema), and fewer hives (urticaria) ^[13].

Blood tests checking for specific bullous pemphigoid antibodies (like BP180 and BP230) are also used as an adjunct to diagnosis. In drug-associated cases, these antibody levels can sometimes be lower or even negative ^[14]. Because these are only tendencies, a negative blood test does not rule out the disease, and these tests do not replace a proper biopsy.

What Happens If a Medication is Suspected?

Never stop taking prescribed diabetes, heart, or blood pressure medications without speaking to your doctor. Doing so can lead to dangerous spikes in blood sugar or fluid buildup.

If your clinical team suspects a medication is contributing to your blisters, they will carefully weigh the risks of the medication against its benefits for your overall health ^[1]. If they decide it is safe to stop the drug, they will help you transition to an alternative treatment.

Stopping the suspected medication is rarely a quick fix. While a small number of patients see their blisters resolve after stopping the drug ^[15], many others require standard bullous pemphigoid treatments—such as topical or oral corticosteroids—to calm the immune system ^[16][17]. Improvement is highly variable; it may take weeks or months, and some patients continue to have disease activity despite stopping the drug ^[6][18]. Therefore, active treatment for your blisters should not be delayed while waiting to see if a medication change helps.