- Taking a drug that is a frequent cause of allergy (i.e. you are
more likely to develop an allergic reaction when you are under
treatment with penicillin than when you are treated with other
kinds of antibiotics).
- A previous allergic reaction to a drug from the same family.
For example, a person who has developed an allergic reaction to
penicillin has a high chance of reacting in the same way when
taking ampicilin. Similarly, a person who reacts to aspirin will
probably react to other anti-inflammatory or painkiller drugs such
as Ibuprofen, Indomethacin, Diclofenac, etc.
- Treatment of longer duration or frequent treatment courses over
a short period of time with the same drug are more likely to result
in allergy.
- Applying a drug to the skin is more likely to result in allergy
compared with taking the same drug orally.
- Family history of allergy to drugs (the risk is even higher when there is history of allergy to the same drug).
Patients & Public
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Allergic diseases > Drug allergy
Which are the factors that put you at risk of becoming allergic to
drugs?
Tip: people who are allergic to other kinds of
allergens (house dust mites, pollens, animals, moulds or foods) do
not have a higher risk of developing drug allergy compared to
people who are not allergic. However, if they do develop drug
allergy, they are at risk of developing a more severe form.