Any person can get an allergic drug
reaction to any drug. Allergic drug reactions are less common than other types
of drug reactions. For a drug allergy
to happen, you must have taken the drug before. You are more likely to get an
allergy to a drug that gave you a drug allergy before. You can lose a drug
allergy. You also might have a reaction that looks like a drug allergy but is
not a true drug allergy.
If you have a family member who had
a drug allergy, then you are more likely to have an allergy to any drug. However,
you are not more likely to develop a drug reaction to that drug. If you never
had the drug before, then you cannot develop a drug allergy to that drug.
You might expose yourself to that
drug without knowing it. For example, you might eat a food that contains an
antibiotic. Then you could develop a drug allergy to that antibiotic, if you
take the antibiotic for an infection.
Penicillin causes most allergic drug
reactions. If you react to penicillin, then you may not react to related drugs.
This is true for drugs with a very different chemical makeup.
may cause allergic drug reactions. There are many nonantibiotic sulfonamide-containing
drugs. Most people with a sulfonamide antibiotic drug allergy do not suffer
allergy to the nonantibiotic sulfonamide drugs.
You are more likely to have a
medication allergy if you take the drug through your veins. When you take a
drug through your veins, the drug goes immediately into your blood system. The
higher the amount of the drug in your blood system, the more likely you will
have an allergic drug reaction to it. Less often, you can get a drug allergy
from swallowing the drug. The more often you take a drug, the more likely you
will have a drug allergy to it.
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