How long does a serious allergic reaction last

How Long Does A Serious Allergic Reaction Last. Even with adequate treatment some allergic reactions may take two to four weeks to go away. Even with adequate treatment some allergic reactions may take two to four weeks to go away. In rare occasions it may continue for up to 9 to 10 weeks. They may take a few hours to a few days to disappear.

Rash fever and organ problems begin within 1 to 2 weeks after you start the drug. Send thanks to the doctor Dr. 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. It can last for three to six days 3. Sulfonamide drug hypersensitivity syndrome. Treatment and healing time depend on the type of chemical you came into contact with.

Usually it takes from 12 hours to 3 days.

Rash fever and organ problems begin within 1 to 2 weeks after you start the drug. However in usual cases an allergic reaction to shrimp may last for a day or two. Typically hives due to a medication will last for only a few days. Typically it takes from 12 hours to 3 days. They may take a few hours to a few days to disappear. This reaction can occur within minutes or even seconds of exposure.