Erlotinib is an anti-cancer drug used in the treatment of non-small non-small cell lung cancer (NSCLC). This medication targets drug therapy that is differentiated as an epidermal factor receptor. This medication is used to treat lung cancer; it slows down or stops the growth of cancer cells. It is available in the strengths of 25 mg, 100 mg, and 150 mg. The patient administering can experience side effects of Erlotinib such as renal disorder, skin, hair, and nail disorders, ocular disorders, and gastrointestinal disorders. If one experiences these side effects, immediately consult the doctor and observe the patient.