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An antidepressant that worked and then stopped is common, and it has a name. Clinicians call it loss of response or tachyphylaxis, and it is reported in roughly 9 to 33 percent of people taking SSRIs (Katz 2011). It does not mean you are back to square one.
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Updated August 2026 · Reviewed by Nefretiri Abat, PMHNP-BC
Thyroid problems, sleep apnea, low iron, low vitamin D, and chronic pain all cause depression to break through a medication that was working. These are simple tests.
A second condition can also surface later, particularly bipolar disorder, ADHD, or a trauma history that was never addressed.
One thing worth knowing before you stop a medication: restarting the same one later does not reliably bring the response back.
When several rounds of adjusting stop producing lasting improvement, it is reasonable to look at treatments that work through a different mechanism:
Both usually need prior authorisation. See fees and insurance, and treatment-resistant depression for the fuller picture.
When the medication worked, when it stopped, what changed around that time, and any doses you missed. That timeline usually points straight at the cause.
If you are feeling hopeless or having thoughts of hurting yourself, say so directly. If you are in danger now, call or text 988.
Tolerance, a new stressor, a second diagnosis, a medical cause, or missed doses. Often more than one.
Frequently, and it is usually tried first.
Sometimes, but response after restarting is less reliable than people expect.
Not the same thing, though the options overlap if it keeps happening.
Medically reviewed by Nefretiri Abat, J.D., PMHNP-BC, board-certified Psychiatric-Mental Health Nurse Practitioner.
Loss of response during ongoing treatment is well documented and reported in roughly 9 to 33 percent of people on SSRIs. Causes include tolerance, a new stressor, an unrecognised second diagnosis, thyroid or sleep problems, and missed doses.
Often it is the first thing tried and it sometimes works. If a higher dose does not help or is not tolerated, switching or adding a second medication comes next.
Sometimes, but not always. Response after restarting the same medication is less reliable than people expect, which is worth knowing before stopping.
Not exactly. Treatment resistance usually means two medications never worked adequately. Losing response is different, though repeated episodes can lead to the same treatment options.
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