allergic reaction to meds symptoms
Most allergic reactions occur within hours to two weeks after taking the medication and most people react to medications to which they have been exposed in the past. This process is called sensitization.. However, rashes may develop up to six weeks after starting certain types of medications. The most severe form of immediate allergic reactions is anaphylaxis (an-a-fi-LAK-sis). Symptoms of anaphylaxis include hives, facial or throat swelling, wheezing, light-headedness, vomiting and shock. Other signs and symptoms of drug allergies include: 1  Dizziness. 2  Diarrhea. 3  Nausea. Vomiting.  Abdominal 1  cramps. Seizure.  Low blood 1  pressure. Fainting. Article Sections. Drug hypersensitivity results from interactions between a pharmacologic agent and the human immune system. These types of reactions constitute only a small subset of all adverse drug reactions. Allergic reactions to medications represent a specific class of drug hypersensitivity reactions mediated by IgE. • Skin reactions (i.e. rashes, itching) are the most common form of allergic drug reaction. • Non-steroidal anti-inflammatory drugs, antibiotics, chemotherapy drugs, monoclonal antibodies, anti-seizure drugs and ACE inhibitors are frequent causes of allergic drug reactions. A drug allergy is an allergic reaction to a medication. With an allergic reaction, your immune system, which fights infection and disease, reacts to the drug. This reaction can cause symptoms such as rash, fever, and trouble breathing. True drug allergy is not common. The medication can be taken by mouth, injected into the body or rubbed on the skin. The symptoms from an allergic reaction vary from a mild skin rash to sudden swelling of many body parts with life threatening fall in blood pressure. How They Work: Antihistamines used to treat allergy symptoms fall into two broad categories: sedating and non-sedating. The first category includes the older antihistamines. These allergy drugs relieve allergy symptoms but cause drowsiness and other side effects, including dry mouth. Newer antihistamines are said to be non-sedating, although some users may experience drowsiness even from these. What are the signs and symptoms of an allergy to drug (medication) allergy? Drug allergic reactions are similar to allergic reactions resulting from food and other substances that we ingest. A person's genetic make-up helps determine what they are allergic to, and the severity of their allergies. A less common type of allergic reaction is called serum sickness. This can occur days or even a week after starting a medication, even if you have never been exposed to the medication before. The symptoms of serum sickness include skin rashes, hives, fever and joint pain. In rare instances, a different type of allergic reaction can cause red blood cells to be destroyed. More serious reactions involve swelling of lips, tongue that can cause difficulty breathing (anaphylaxis) that can lead to death. Other signs and symptoms of drug allergies include: Dizziness. Diarrhea.
Rash, fever, and trouble breathing.