August 17, 2005-- Posted at 3:00 PM CDT
(HealthDayNews) -- Allergic reactions to medications can occur with drugs you've taken before without incident -- or to a drug that your doctor hasn't prescribed to you before.
According to Health Canada, most allergic reactions occur within one hour of taking the medication.
Signs of an allergic reaction include:
- Hives, which are itchy, red and swollen patches on the skin.
- A skin rash.
- Itching of the lips, tongue and possibly face.
- Sensitivity of the skin to sunlight.
If you experience anything unexpected after starting a medication, tell your doctor immediately.