In order to decide this, studies often look at the adverse effects caused by the medication in comparison to the overall symptom improvement. While multiple studies have shown an improvement or efficacy rate of over 50%, the concern of severe side effects – such as suicidal ideation or suicidal attempts, worsening of symptoms, or increase in hostility – are still concerns when using antidepressants. However, an analysis of multiple studies argues that while the risk of suicidal ideation or attempt is present, the benefits significantly outweigh the risks. Due to the variability of these studies, it is currently recommended that if antidepressants are chosen as a method of treatment for children or adolescents, the clinician monitor closely for adverse symptoms, since there is still no definitive answer on why they are depressed. == References ==
Side effects
Common are:

infusion site reactions
low blood pressure
hair loss
pain and or burning at the IV site
constipation or diarrhea
metallic food taste
bone marrow suppression, leading to:
decreased white blood cell counts (leading to increased susceptibility to infections)
low red blood cell counts (anemia)
low platelet counts (leading to easy bruising and bleeding)Less common are:

nausea and vomiting
allergic-type reactions
rash
fever, often occurring shortly after IV administration and not due to infection
mouth sores
acute myeloid leukemia (which can be treated with etoposide itself)When given with warfarin, it may cause bleeding. Pharmacology
Mechanism of action
Etoposide forms a ternary complex with DNA and the topoisomerase II enzyme, which is an enzyme that aids in relaxing negative or positive supercoils in DNA. Topoisomerase II normally will form a double-stranded break in one DNA double-strand, allow another to pass through, and re-ligate the broken strands. Etoposides binding prevents topoisomerase II from re-ligating the broken DNA strands, which causes the DNA breaks made by topoisomerase II to stay broken, and also prevents the topoisomerase II molecule from leaving the site and relieving tension elsewhere. This results in a double-strand break in the DNA that can have various deleterious effects on the cell, and depletion of topoisomerase II available to relieve further tension. Cancer cells rely on this enzyme more than healthy cells, since they divide more rapidly. Therefore, this causes errors in DNA synthesis and promotes apoptosis of the cancer cell. Chemistry
Etoposide is a semisynthetic derivative of podophyllotoxin from the rhizome of the wild mandrake (Podophyllum peltatum). More specifically, it is a glycoside of podophyllotoxin with a D-glucose derivative.