Sizodon MD 4 mg is a branded formulation of risperidone, an atypical antipsychotic medication manufactured by Sun Pharmaceutical Industries Ltd. in Bangladesh. It is primarily prescribed for the treatment of schizophrenia, bipolar disorder, and mania. Risperidone works by modulating the activity of neurotransmitters in the brain, particularly dopamine (D₂) and serotonin (5-HT₂) receptors, which helps alleviate symptoms such as delusions, hallucinations, mood swings, and irritability. The "MD" in the name stands for "Modified Release", indicating that the tablet is designed to release the medication gradually over time. This formulation enhances patient compliance by reducing the frequency of dosing. Sizodon MD 4 mg is typically administered once or twice daily, with or without food, as per the prescribing physician's instructions.