Starting an SSRI: what to expect in the first weeks
How SSRIs work, common early side effects, and when you might start to feel better.
Earl Johns, MSN, PMHNP-BC
Board-certified psychiatric nurse practitioner and founder of Wellthy Psychiatry & Wellness
✓ Medically reviewed by Earl Johns, MSN, PMHNP-BC
Starting an antidepressant can bring hope and some nerves. Knowing what to expect can make the first weeks easier.
How SSRIs work
Selective serotonin reuptake inhibitors, or SSRIs, help adjust how the brain uses serotonin. They’re commonly used for depression, anxiety, OCD and PTSD.
The first few weeks
Some people notice mild nausea, headaches, sleep changes or a jittery feeling early on. These often ease within one to two weeks. Starting low and going slow helps.
When you may feel better
Sleep and energy may improve first. Mood benefits usually build over four to eight weeks. It’s normal not to feel a big change right away.
Stay in touch
Let your provider know about side effects or concerns, including sexual side effects, which can often be addressed. If you have thoughts of harming yourself, call or text 988 right away.
A gentle next step
A free 15-minute phone consult is an easy way to see if Wellthy Psychiatry feels like the right fit for you.
This article is for general education and isn’t medical advice. If you’re in crisis, call or text 988, the Suicide & Crisis Lifeline, or call 911.
About the author
Earl Johns, MSN, PMHNP-BC
Board-certified psychiatric nurse practitioner · UCSF-trained · Founder of Wellthy Psychiatry & Wellness
Earl provides LGBTQ+ and neurodivergent-affirming psychiatric care, blending medication management, therapy and whole-person approaches. He sees clients in San Francisco and by telehealth across California.
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