Medication Allergies: What to Know

Managing Medication Allergies

So if you’ve had allergic reaction to a medication, must you always steer clear of that drug? It depends on the individual—and depends on the drug. For instance, many people with true penicillin allergies eventually outgrow them. “One study found that 80 percent of people who reported an allergic reaction more than 10 years ago no longer had the penicillin allergy after subsequent testing,” Dr. Hong says.

Before taking a drug that you’ve reacted negatively to in the past, see an allergist for further evaluation. “Depending on the type of reaction you’ve had, we may consider keeping you away from this medication,” Dr. Hong says. If possible, a doctor may also perform a skin test and/or a challenge test to gauge your reaction. “A challenge test involves giving you the medication in an allergy clinic, sometimes in graded doses, monitoring you closely and treating any allergic reactions should they arise,” Dr. Hong says.

Although it’s very rare, certain vaccines can trigger allergic reactions as well, in which case you’d also want to see an allergist. “If a true allergy is suspected, we can perform skin testing to the vaccine and sometimes specific components of the vaccine,” Dr. Hong says. “If this confirms the allergy, we may still be able to administer the vaccine in small, graded doses if it is important that you be vaccinated.”

If you’ve never had an allergic reaction to a certain drug but a family member has, Dr. Hong says there’s a slim chance you could be allergic too. “But the risk isn’t significant enough to warrant additional testing or evaluation,” he explains. “If you take antibiotics frequently, particularly in IV form, or if you already know you’re allergic to multiple medications, then your risk is greater.”