Which of the following is an SSRI?

• A. Effexor (venlafaxine)
• B. Prozac (fluoxetine)
• C. Wellbutrin (bupropion)
• D. Remeron (mirtazapine)

Answer: (B)

SSRI means blocking the serotonin transporter to prevent reuptake, leaving more serotonin available in the synapse to help improve mood. Fluoxetine is a classic example of this class, known for its selective effect on serotonin reuptake. The other drugs work via different mechanisms: venlafaxine is an SNRI, inhibiting both serotonin and norepinephrine reuptake; bupropion is an NDRI, mainly affecting norepinephrine and dopamine; mirtazapine is a NaSSA, influencing norepinephrine and serotonin pathways in a distinct way. So, fluoxetine is the SSRI among them.