A drug allergen is a substance that can cause allergic reactions in people taking certain medications or medications. This is known as a drug allergy and can be very serious, especially if the person is unaware that they are allergic to the drug.
A drug allergen is a substance that can cause allergic reactions in people taking certain medications or medications. This is known as a drug allergy and can be very serious, especially if the person is unaware that they are allergic to the drug.