My Antidepressant Stopped Working. What Now?

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.

First, rule out the simple causes

• Missed doses. Even a few skipped days can drop levels enough to matter.
• A new medication that interacts with it.
• A pharmacy switch to a different generic manufacturer.
• Alcohol or cannabis use that has increased.
• A new stressor that would strain any treatment.

Then check what is underneath

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.

What usually gets tried next

• Raise the dose. Often first, and it frequently works.
• Add a second medication alongside the current one.
• Switch to a medication that works differently.

One thing worth knowing before you stop a medication: restarting the same one later does not reliably bring the response back.

If none of that holds

When several rounds of adjusting stop producing lasting improvement, it is reasonable to look at treatments that work through a different mechanism:

• TMS therapy. Magnetic pulses, awake in a chair, no sedation. In 307 patients across 42 clinics, 58 percent improved and 37 percent reached remission (Carpenter 2012).
• Spravato (esketamine). Nasal spray given in our office with monitoring afterward, FDA-approved for treatment-resistant depression.

Both usually need prior authorisation. See fees and insurance, and treatment-resistant depression for the fuller picture.

What to bring to your appointment

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.

Common questions

Why did it stop working?

Tolerance, a new stressor, a second diagnosis, a medical cause, or missed doses. Often more than one.

Will a higher dose help?

Frequently, and it is usually tried first.

Will it work again if I restart it later?

Sometimes, but response after restarting is less reliable than people expect.

Is this treatment-resistant depression?

Not the same thing, though the options overlap if it keeps happening.

References

• Katz G. Tachyphylaxis/tolerance to antidepressive medications: a review. Isr J Psychiatry Relat Sci. 2011;48(2):129-135. PubMed
• Carpenter LL, Janicak PG, Aaronson ST, et al. Transcranial magnetic stimulation for major depression: a multisite, naturalistic, observational study. Depress Anxiety. 2012;29(7):587-596. Journal

Medically reviewed by Nefretiri Abat, J.D., PMHNP-BC, board-certified Psychiatric-Mental Health Nurse Practitioner.