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I am gaining weight with Paroxetine. Shall I opt Zoloft?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hi doctor,

I have OCD and bipolar depression. I am taking Paroxetine and Mirtazapine for OCD and sleep, respectively. I am gaining too much weight. Can I switch to Zoloft?

Please advise.

Thank you.

Hi,

Welcome to icliniq.com.

I can understand your concern.

Both Mirtazapine and Paroxetine are known to cause weight gain. Sertraline (Zoloft) also causes some weight gain. So, in my opinion, shifting to Sertraline will not be a good idea. Other SSRIs (selective serotonin reuptake inhibitors) like Fluoxetine or Escitalopram can be tried instead of Paroxetine.

Fluoxetine does not cause much weight gain and is considered safe. The drug has great efficacy in controlling OCD (obsessive-compulsive disorder) symptoms, too. For sleep, I suggest low dose Benzodiazepines instead of Mirtazapine. The benzodiazepines will relieve anxiety and help with sleep. Discuss these drugs with your doctor.

I hope this helps you.

Thank you.

Patient's Query

Thank you, doctor, for the reply.

I would like to know whether taking Fluoxetine will not affect my bipolar (irritability) or my sleep (worsen insomnia). I am currently taking Paroxetine 60 mg and Mirtazapine 30 mg. I am not using any mood stabilizer. How should I switch to SSRIs?

Please advise.

Hi,

Welcome back to icliniq.com.

Fluoxetine is relatively safe in bipolar disorder as compared to other SSRIs like Paroxetine, which you are taking. The drug should reduce irritability. Fluoxetine causes insomnia and should be taken preferably in the morning after breakfast. Evening doses should not be given, so the drug will not result in disruption of your sleep.

Taking a low dose Benzodiazepine like Clonazepam will help with good sleep. Cross-tapering is the best option to stop using the drug. Reduce the dose of Paroxetine slowly over four weeks and increase the dose of Fluoxetine over four weeks. This will not cause any withdrawal symptoms.

I hope this helps you.

Thank you.

Medically reviewed byiCliniq medical review team

Published At September 16, 2016
Reviewed AtJune 1, 2026

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