What are side effects and adverse reactions?
- February 21, 2011
Any research study involves some risk because some of the side effects of the experimental drug or therapy under investigation are unknown. While side effects can be negative or positive, an adverse reaction is a negative side effect directly related to the drug. Examples include headache, nausea, skin irritation or other physical problems that may be caused by drug interaction, dosage levels, or an individual’s sensitivity to the experimental drug.