Caution

Together they add sedation, and dehydration can push lithium levels up.

Do this

Keep up water, and keep naloxone nearby.

General answer for Opioids: nothing specific to these two is documented.

Where the risk isTap for why
What “Caution” means

Carries risk that is worth understanding before combining. Reduce doses and do not use alone.

How the ratings work
The longer explanation

No direct pharmacokinetic interaction, but additive sedation and any dehydration or reduced kidney perfusion can raise lithium levels. Note that lithium with tramadol specifically is rated dangerous because of tramadol's serotonergic activity.

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Other names
Lithium
lithium carbonate, lithobid, mood stabilizer
Tianeptine
gas station heroin, tianaa, zaza red, neptune's fix, pegasus, td red
Sold as a supplement — at the doses people take, a full opioid
Also searched aslithium and gas station heroin, lithium and tianaa

Related combinations

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Can you mix Lithium and Tianeptine (gas station heroin)?

MixSafe rates mixing Lithium and Tianeptine as "Caution" — carries risk that is worth understanding before combining. Reduce doses and do not use alone. No interaction specific to Lithium and Tianeptine is documented; this is the default for Opioids. Source: MixSafe research. Educational information, not medical advice.

This is a class-level answer, inherited from Opioids. Nothing specific to this exact pair is documented, so treat it as the default for the class rather than a measurement of these two drugs together.