The Short Answer
Allow the troche to dissolve fully under your tongue — typically 15 to 30 minutes depending on the formulation — and then hold the medicated saliva in your mouth for an additional 5 to 15 minutes before swallowing or spitting. Total sublingual hold time should be approximately 20 to 45 minutes from placement to swallow or spit.
Why Hold Time Matters
Every minute the medicated saliva remains in contact with your sublingual mucosa is time during which ketamine is being absorbed directly into your bloodstream, bypassing the liver. Swallowing too early redirects the remaining ketamine to your stomach, where first-pass metabolism reduces bioavailability from approximately 25-30% (sublingual) to 17-20% (oral).
The difference may sound small in percentage terms, but it translates to a meaningful difference in the amount of active drug reaching your brain — and therefore in the therapeutic effect of each session.
Dissolution Phase (15-30 Minutes)
During this phase, the troche physically dissolves. The speed varies by formulation:
- Hard candy bases: Slower dissolution, often 20-30 minutes
- Soft gelatin bases: Faster, typically 10-20 minutes
- Rapid dissolve tablets (RDTs): May dissolve in as little as 5-10 minutes
Do not chew, bite, or actively break up the troche. Let it dissolve naturally. Gentle repositioning with your tongue is fine if the troche shifts, but avoid vigorous manipulation.
Saliva Hold Phase (5-15 Minutes)
After the troche has fully dissolved, medicated saliva remains in your mouth. This saliva still contains dissolved ketamine that is actively being absorbed. Continue holding it under and around your tongue for an additional 5-15 minutes.
During this phase:
- Let saliva pool naturally under the tongue and in the floor of the mouth
- Resist the urge to swallow — each swallow sends medicated saliva to the stomach
- Tilt your head slightly forward if saliva pools uncomfortably at the back of the throat
- Breathe through your nose
When to Swallow or Spit
Your provider will advise you on whether to swallow or spit the remaining saliva after the hold period:
- Swallowing adds some additional ketamine absorption through the GI tract (at lower bioavailability), slightly increasing the total dose effect. It may also increase nausea risk.
- Spitting discards the remaining unabsorbed ketamine, producing a slightly lower total effect but potentially less nausea.
There is no universally correct answer — follow your provider's specific guidance based on your treatment goals and tolerance.
Tips for Better Hold Times
- Practice with water first: Before your first session, practice holding a small amount of water under your tongue for 15-20 minutes to get comfortable with the sensation
- Stay reclined: Sitting or lying back reduces the urge to swallow
- Breathe through your nose: Mouth breathing increases salivation and the swallowing reflex
- Set a gentle timer: A quiet alarm at your target hold time removes the need to watch a clock
References
- Sublingual and Oral Ketamine: A Systematic Review — Pharmacokinetic data on sublingual absorption timing and bioavailability
- StatPearls: Ketamine — Clinical reference on ketamine administration routes and absorption characteristics
- PubChem: Ketamine Compound Summary — NCBI chemical database with ketamine pharmacokinetic profiles
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