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How long does an allergic reaction usually last?

I had allergic reaction to some over the counter cough medicine. How long does something like this usually last? Right now I have an itchy rash that is on my arms and hands.
The length of time that your allergic response lasts depends on a few factors. The first (and most important factor) is whether or not the reaction you experienced was a classic immune system allergic response. Other reactions to medications can occur that are not technically allergies. The second factor that is important is how long the medication you took stays in your system. Some medications leave your system after a few hours and other stick around for a while. For most allergic reactions, the initial symptoms begin to go away a few hours after the allergen is removed and should be nearly completely gone after 1-2 days. If the itchy rash that you have on your arms and hands is hives (which would indicate a classic allergic reaction), you should see these go away fairly soon. It would be nice to know if your reaction was an allergic reaction, and if you are allergic to any other medications. For this reason, I suggest that you schedule an appointment with an allergy specialist. This is the type of doctor who can test you for an allergy to this medication and other medications. In addition, he or she can provide treatment, should you experience this rash again. Good luck.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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