Anemia (uh-NEE-me-uh) is a condition in which your blood has a lower than normal number of red blood cells. Anemia also can occur if your red blood cells don't contain enough hemoglobin (HEE-muh-glow-bin). Hemoglobin is an iron-rich protein that gives blood its red color. This protein helps red blood cells carry oxygen from the lungs to the rest of the body. If you have anemia, your body doesn't get enough oxygen-rich blood. As a result, you may feel tired or weak.
Signs and symptoms of a drug allergy often occur within an hour after taking a drug. Less commonly, reactions can occur hours, days or weeks later. Drug allergy symptoms may include: 1  Skin rash. 2  Hives. 3  Itching. 4  Fever. 5  Swelling. 6  Shortness of breath. 7  Wheezing. 8  Runny nose.
An adverse reaction to a drug is any unintended effect of a drug, not including failure of the drug to work, abuse of the drug, or overdose of the drug. Adverse reactions to drugs include both drug allergy and drug intolerance. A drug allergy is caused by the immune system reacting to a drug. There are several different types of drug allergies that lead to allergic reactions. Reactions to drugs range from a mild, localized rash to serious effects on different