I take Synthroid — am I still a candidate for ketamine therapy?

Yes, in nearly every case. Stable, treated hypothyroidism is not a barrier to ketamine therapy. We will ask about your most recent TSH and current dose during the medical screening. If your levels have been steady and your endocrinologist or PCP is satisfied with your control, you are typically a fine candidate.

I have Graves' disease — what does that mean for ketamine?

If your Graves' disease is well-controlled — whether through methimazole, radioactive iodine, thyroidectomy, or another approach — ketamine is often workable. If you are actively thyrotoxic or your labs are unstable, we want your endocrinologist to weigh in before we proceed. Uncontrolled hyperthyroidism is a relative contraindication in the published consensus guidelines.

Could my depression actually be a thyroid problem?

Sometimes — yes. Untreated or undertreated hypothyroidism is a recognized contributor to depressive symptoms and treatment-resistant depression. That is why we ask about thyroid status and recent labs during screening. If you have not had a TSH checked in the last year and you are dealing with persistent low mood, that simple lab is worth running with your PCP before pursuing ketamine.

Do I need bloodwork before starting ketamine therapy?

We do not routinely order thyroid panels at the clinic. If you have not had a TSH recently and you are presenting with depression, we will ask you to have your primary care provider run one first. The reason is simple: a missed thyroid issue is faster and cheaper to treat than ketamine, and we would rather rule that out than treat the wrong target.

What about Hashimoto's thyroiditis?

Hashimoto's itself is not a ketamine concern when your thyroid hormone levels are well-controlled. Most patients with Hashimoto's are on levothyroxine and have stable TSH values. We will check in on your most recent labs and your current dose, but the autoimmune diagnosis on its own does not change our approach.

Ketamine and Thyroid Conditions: Hyperthyroid Caution, Depression Overlap, and Screening

Why uncontrolled hyperthyroidism and ketamine do not mix well

Ketamine is a sympathomimetic drug. That is a clinical way of saying it nudges the cardiovascular system in the same direction the body's stress response does—heart rate trends up, blood pressure trends up, and the heart works a little harder during the infusion. In a healthy adult, those effects are mild, predictable, and self-limiting. Anesthesia-level monitoring catches them, and they resolve on their own as the medication clears.

An overactive thyroid pushes the cardiovascular system in the same direction. Excess thyroid hormone increases heart rate at rest, raises blood pressure, increases cardiac output, and raises the risk of atrial fibrillation and other tachyarrhythmias. The autonomic nervous system in someone with thyrotoxicosis is already running hot.

When you stack ketamine on top of an unrecognized or uncontrolled hyperthyroid state, you are stacking two sympathomimetic stressors. The risk is not theoretical. It is the same risk anesthesiologists manage perioperatively in patients with active Graves' disease or toxic nodular goiter, which is why thyrotoxicosis has historically been controlled before elective procedures whenever possible. The American Thyroid Association's 2016 guidelines published in Thyroid explicitly recommend controlling hyperthyroidism before elective procedures because of the cardiovascular risk profile.

For ketamine specifically, the practical implication is simple. If your hyperthyroidism is well-controlled—TSH and free T4 in the expected range, no symptoms of thyrotoxicosis, your endocrinologist comfortable with where things are—you are usually a workable candidate. If your hyperthyroidism is active and undertreated, that needs to be addressed first.

What the ASRA/AAPM/ASA consensus says about thyroid disease

The 2018 multi-society consensus on intravenous ketamine for chronic pain, authored by Cohen and colleagues and published in Regional Anesthesia & Pain Medicine, is the most cited safety reference in this space. The document was developed jointly by the American Society of Regional Anesthesia and Pain Medicine, the American Academy of Pain Medicine, and the American Society of Anesthesiologists. It lays out absolute and relative contraindications for IV ketamine.

Among the relative contraindications, the consensus lists uncontrolled hyperthyroidism alongside conditions like uncontrolled hypertension, severe cardiovascular disease, and active psychosis. The reason given is the same one we just walked through: the amplified sympathomimetic response in a thyrotoxic patient.

"Relative" is the operative word. It does not mean ketamine is forbidden in anyone with a thyroid history. It means the condition warrants extra screening, possible deferral, and clinician judgment about whether the patient is stable enough to proceed. Stable, treated thyroid disease—hypothyroidism on a steady levothyroxine dose, hyperthyroidism well-managed on methimazole, post-thyroidectomy patients on hormone replacement—is generally not a barrier.

This same consensus underpins our broader screening approach. If you are interested in the wider safety picture, our overview of whether ketamine therapy is safe and our deeper dive into ketamine and hypertension share the same logic: the cardiovascular response to ketamine is the variable we screen most carefully.

Hypothyroidism and depression: a common, reversible overlap

The other half of the thyroid conversation is mood. Hypothyroidism, even in subclinical form, is a recognized contributor to depressive symptoms. Bauer and colleagues, writing in the Journal of Neuroendocrinology in 2008, summarized the established view: subclinical and overt hypothyroidism can produce or worsen depression, and thyroid function should be evaluated in patients with persistent depressive symptoms—particularly those who have not responded well to first-line antidepressants.

This matters because the symptom profile overlaps so closely. Fatigue. Low motivation. Cognitive slowing. Weight changes. Difficulty concentrating. Persistent low mood. A patient walks in convinced they have treatment-resistant depression, and the actual driver is a TSH of 14 that nobody has checked in four years. Treating the thyroid resolves the depression. Ketamine was never the right tool for that situation.

This is not a rare scenario. It is common enough that screening for thyroid dysfunction is built into most psychiatric workup recommendations. Our position at Music City Ketamine is straightforward: if you are pursuing ketamine for depression and have not had a TSH checked recently, we want that done first. Ketamine is FDA-approved as an anesthetic; its use for depression is off-label, and we want to make sure we are addressing the actual root cause before booking a course of infusions.

For patients who have had a thorough medical workup, including thyroid labs, and whose depression has persisted despite adequate treatment, ketamine remains a strong option. Our article on ketamine for treatment-resistant depression covers what the research suggests in that population. The thyroid screen is simply a step that comes earlier in the decision tree.

Stable, treated thyroid disease is usually fine

It is worth saying clearly, because the framing above can sound more cautious than the practical reality: most people with a thyroid diagnosis are good candidates for ketamine therapy. The conditions that warrant pause are specifically active, undertreated thyrotoxicosis or untreated hypothyroidism in someone presenting for depression.

Hashimoto's thyroiditis on a stable levothyroxine dose with a TSH in range? Generally fine. Graves' disease in remission after radioactive iodine, currently on hormone replacement, levels stable? Generally fine. Post-thyroidectomy patient who has been euthyroid for two years on the same Synthroid dose? Generally fine. Subclinical hypothyroidism that your endocrinologist is monitoring without medication? Worth a conversation, but usually not a barrier.

The autoimmune piece—Hashimoto's, Graves'—does not change anything about how ketamine itself behaves in the body. What matters is the resulting thyroid hormone level and how your cardiovascular system is responding to it on the day of the infusion.

What we ask about thyroid during medical screening

During the consultation and the pre-infusion medical screening, we ask a small set of practical questions:

Have you ever been diagnosed with a thyroid condition? Hypothyroidism, hyperthyroidism, Hashimoto's, Graves', thyroid nodules, thyroid cancer history, post-surgical or post-radioiodine status.
Are you on thyroid medication? Levothyroxine (Synthroid, Levoxyl, Tirosint), liothyronine (Cytomel), desiccated thyroid (Armour, Nature-Throid), methimazole (Tapazole), or propylthiouracil. Current dose and how long you have been stable on it.
When was your last TSH? If it has been more than a year, or if your dose has changed recently, we may ask you to coordinate with your prescribing provider for an updated lab.
Any current symptoms of thyroid imbalance? Resting heart rate over 100, heat intolerance, unexplained weight loss, tremor, or anxiety that came on suddenly (hyperthyroid signs); or fatigue, cold intolerance, weight gain, dry skin, and constipation that are new or worsening (hypothyroid signs).
Who manages your thyroid? Endocrinologist, primary care, or self-managed. We want to know who to refer questions back to.

None of these questions are unusual. They are the same questions any anesthesia or pain provider would ask. The point is to make sure your thyroid status is known and stable before we add a sympathomimetic medication to the picture. The same screening discipline shows up in our piece on ketamine and heart conditions, because the underlying concern—cardiovascular load during the infusion—is the same.

When to talk to your endocrinologist before booking

Some thyroid situations warrant a check-in with your endocrinologist before we schedule infusions. We are not going to give you a full diagnostic answer at the clinic; thyroid management lives with the specialist. We will defer those questions to them.

Talk to your endocrinologist before booking if:

You have hyperthyroidism that is not well-controlled, or you have not had recent labs to confirm control.
You have Graves' disease and your symptoms have changed recently, or you have had a flare.
Your thyroid medication dose changed in the last three months and your levels are still settling.
You have a new diagnosis of thyroid disease and have not yet started treatment.
You have known thyroid nodules being worked up and the diagnosis is still open.

For these situations, a short message to your endocrinologist asking whether they consider your thyroid status stable enough for an elective procedure with a sympathomimetic medication is the most useful step. If they say yes and your labs back it up, we can usually proceed. If they want to wait, we wait.

Lab work we may request

We do not routinely order thyroid panels at the clinic. Most patients arrive with a recent TSH on file from their PCP or psychiatrist, and that is what we work from. When labs are needed, we ask the patient's existing prescribing provider to run them.

The tests that come up most often:

TSH (thyroid-stimulating hormone)—the single most useful screening number. A normal TSH essentially rules out clinically significant hypothyroidism or hyperthyroidism in most patients.
Free T4 and free T3—ordered if the TSH is abnormal or if there is a clinical reason to look closer.
Thyroid antibodies—TPO and thyroglobulin antibodies if Hashimoto's is suspected; TSI for Graves'. These are usually managed by the endocrinologist and rarely change our day-of-infusion plan.

If you are pursuing ketamine for depression and have not had a TSH in over a year, that lab is worth running before your first ketamine infusion. It is fast, cheap, and occasionally redirects the entire treatment plan.

One last note on framing. Ketamine is FDA-approved as an anesthetic; its use for depression and chronic pain is off-label. That status does not change the safety profile for thyroid patients, but it does reinforce why we screen carefully. We want the right patients getting the right treatment, and a thyroid panel is one of the simpler ways to make sure that is the case. If you would like to see how the rest of our screening fits together, our safety page and our depression overview lay it out.