Antidepressants are a class of medication designed to alleviate symptoms of depression, a condition characterised by persistent sadness, lack of interest in activities and an overwhelming sense of despair. The history of antidepressants dates back to the 1950s, with the accidental discovery of iproniazid, initially developed to treat tuberculosis, which was found to have mood-elevating properties. This paved the way for the development of various classes of antidepressants, each working through different mechanisms to influence mood-regulating chemicals in the brain, such as serotonin, norepinephrine and dopamine.
The primary effect of antidepressants is to correct imbalances in these neurotransmitters, which are key factors in depression. By increasing the levels of these chemicals in the brain, antidepressants can improve mood, enhance energy levels and restore interest in life.
There are several different types of antidepressants, including:
Selective serotonin reuptake inhibitors (SSRIs)
These are the most commonly prescribed antidepressants, which are known for their relatively fewer side effects. Examples include fluoxetine (Prozac), citalopram (Celexa) and sertraline (Zoloft).
Serotonin and norepinephrine reuptake inhibitors (SNRIs)
These medications include venlafaxine (Effexor) and duloxetine (Cymbalta), which affect both serotonin and norepinephrine.
Tricyclic antidepressants (TCAs)
An older class of medication, including amitriptyline and clomipramine, is known for their potent effects but higher risk of side effects.
Monoamine oxidase inhibitors (MAOIs)
This is another older class of drugs, which includes phenelzine and tranylcypromine but is used less frequently due to dietary restrictions and side effect profiles.
Atypical antidepressants
This group includes medications that don’t fit neatly into the other categories, such as bupropion (Wellbutrin), which affects dopamine and norepinephrine.