12
Jul
How Long Does A Drug Reaction Rash Last. Who are at risk. Rashes may appear suddenly within minutes after a person takes a drug or they may be delayed for hours days or even weeks. On the first occasion a morbilliform rash usually appears 12 weeks after starting the drug but it may occur up to 1 week after stopping it. Most people with drug allergy recover very quickly once the medication is stopped although the rash can take 10-14 days to fade.
The rash will likely clear up without complications in two to three weeks as long as the person is not re-exposed to the allergen. Some patients have their rash for more than six days. But in some cases it can take a drug up to two weeks to cause a rash. Fixed drug eruptions can take days to weeks as can ery. To know if a rash is clearing up looking for signs will be essential. On the first occasion a morbilliform rash usually appears 12 weeks after starting the drug but it may occur up to 1 week after stopping it.
Jack Mutnick answered 17 years experience Allergy and Immunology Depends.
People with severe reactions may take a long time to get better especially if they are elderly or have other medical conditions. A rash can last 1-6 days depending on the severity. If it developed over time it will take longer to fade as you have a build up of that medication in your system and you will likely continue to suffer some kind of rash until the medication is completely out of your system. Rashes may appear suddenly within minutes after a person takes a drug or they may be delayed for hours days or even weeks. It can last for three to six days 3. Type of skin rashes and their signs.