Pharmacogenetics is the study of how genes (DNA) affect the body’s response to certain medication. The genes carry information that determines how safe and effective a particular drug could be for you. Genes can be the reason why the same medication at the same dose will affect different individuals in very different ways. Genes may also be the reason why some individuals have Adverse Drug Reaction (ADR), commonly referred to as “side effects”, to certain medication, while others have none. Pharmacogenetic testing looks at your specific genes to assist you in determining which types of medication and dosages that may be more effective for you.