Unidep Sr 150mg Tab is a prescription antidepressant medication used to treat major depressive disorder (MDD) and seasonal affective disorder (SAD). It is also commonly prescribed as part of a smoking cessation program to help people quit smoking by reducing nicotine cravings and withdrawal symptoms.

Bupropion works as a norepinephrine-dopamine reuptake inhibitor (NDRI), which means it increases the levels of these two essential brain chemicals responsible for regulating mood, motivation, and concentration. Unlike many other antidepressants, Bupropion does not significantly affect serotonin levels, making it an effective alternative for those who experience side effects with SSRIs or SNRIs.

This medication provides a dual benefit — improving mood and reducing cravings — making it one of the most versatile options for patients dealing with depression, low energy, or nicotine addiction. It is often chosen for its favorable side-effect profile, as it typically does not cause weight gain or sexual dysfunction, which are common with other antidepressant classes.