04
Sep
How Long Can A Drug Allergic Reaction Last. People with severe reactions may take a long time to get better especially if they are elderly or have other medical conditions. Most of the time symptoms will appear between 1-2 hours after taking the drug unless you have a more rare delayed type reaction. The time varies from person to person. An anaphylactic reaction could occur minutes after you take the drug.
If the exposure to the allergen continues such as during a spring pollen season allergic reactions may last for longer periods such as a few weeks to months. 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. Typically it takes from 12 hours to 3 days. Some people may react right away while others might take the drug several times before they have an allergic reaction. Most commonly a majority of people will have clear skin after about one to three weeks but a rash can last for over six weeks in more severe cases. Depends on the type of reaction.
Treatment and healing time depend on the type of chemical you came into contact with.
The dose is increased a little at a time until the full dose is reached and the medicine stops causing an allergic reaction. The dose is increased a little at a time until the full dose is reached and the medicine stops causing an allergic reaction. Serum sickness which may cause fever joint pain rash swelling and nausea. Less common drug allergy reactions occur days or weeks after exposure to a drug and may persist for some time after you stop taking the drug. Allergic reactions to drugs are usually self-limiting and only last for a few days after the drug is discontinued. Rarely an allergic skin reaction can cause marked sloughing of the skin a condition called toxic epidermal necrolysis TEN.