Can You Take Selank With Tirzepatide or Semaglutide?

The medications this page covers:

Every price is all-in, covering medication, physician review, refill management and shipping, with no membership fee. GLP-1 prices are "from" prices because they are priced by dose. Compounded medications are not FDA approved.

Selank

Selank is a seven-amino-acid peptide built from tuftsin, a fragment of immunoglobulin G, with a Pro-Gly-Pro tail added to slow its breakdown. The mechanism most often cited is at the GABA-A receptor: a 2018 paper in Protein and Peptide Letters, using rat brain-cell membranes, reported that Selank changed how GABA itself bound, in the manner of a positive allosteric modulator. An older line of work describes it slowing the breakdown of enkephalins. It is not a benzodiazepine, and its Russian trials, which compared it with benzodiazepines, reported no sedation, memory impairment, dependence or withdrawal over the study periods. Those trials used the intranasal Russian product. See what is Selank.

Tirzepatide

Tirzepatide activates the GIP and GLP-1 receptors. It acts on appetite centres in the brain, slows gastric emptying and changes insulin and glucagon signalling, and it is dosed once a week. See what is tirzepatide.

People sometimes ask about Selank because they started feeling anxious after starting a GLP-1. Pepti's references do not list anxiety or depression among tirzepatide's side effects, and for semaglutide a large 2024 Nature Medicine cohort of over 240,000 people reported lower rates of suicidal thoughts than on other weight-management drugs; the suicidal-behavior warning on the approved semaglutide weight-management label was removed in February 2026. But several physical GLP-1 effects produce sensations that feel like anxiety.

Describe exactly what you feel and when, so your care team can tell these apart. Adding Selank to treat what is actually low blood sugar or dehydration would miss the cause. More is in GLP-1 anxiety and depression.

Early fatigue or a flat feeling

Some people describe fatigue or a flat, low-drive feeling in the first days of Selank, usually settling. On tirzepatide, fatigue was reported by 5 to 7% against 3% on placebo, and on semaglutide by 11% against 5%, often linked to eating and drinking less early on. Starting both in the same week makes tiredness impossible to place.

Feeling wired

A small number of people report feeling wired on Selank, and a 2008 Russian trial described it as mildly activating. A faster heart rate on a GLP-1 can feel similar. Report either if it persists.

If you take an SSRI, SNRI, benzodiazepine or antipsychotic, or have been diagnosed with panic disorder, bipolar disorder or major depression, that treatment comes first, and Selank is at most an adjunct that your prescriber may or may not agree to. There are no interaction studies of Selank with SSRIs, SNRIs, stimulants or antipsychotics. Never stop or reduce a psychiatric medication to make room for Selank or to help a GLP-1 work.

Two more points connect the three. Several antidepressants and antipsychotics are described in reviews as promoting weight gain, which can be part of why weight is hard to shift. And a GLP-1 slows stomach emptying, which can change how quickly oral medications are absorbed in the first weeks after starting or increasing the dose. List every medication on your intake, and if another prescriber manages your mood, tell them you have started a GLP-1 and Selank. An active eating disorder is a situation where a GLP-1 is usually avoided; say so on the intake if it applies.

The blends carry Selank at 1 mg/mL, so the same 25 unit draw holds 0.25 mg rather than 0.5 mg. Never take Selank alone on top of a blend that contains it without your physician knowing. See what is the SERENITY blend, what is the ELEVATE blend and what is the SYNAPSE blend.

The schedules are independent, and there is no described need to separate them by hours. Use a separate fresh syringe for each and never draw both into one. Dosing detail is in Selank dosage and tirzepatide dosing chart. Never change either dose yourself.

Everything above applies to semaglutide. It acts at the GLP-1 receptor only, where tirzepatide acts at two, but its anxiety-like effects are the same kind: low blood sugar with insulin or a sulfonylurea, dizziness, a small rise in resting heart rate, and fatigue in the early weeks. Its label's suicidal-behavior warning was removed in February 2026. Semaglutide and tirzepatide are never taken together. See semaglutide side effects.

Selank's trials are small, 60 to 70 patients each, all from the groups that developed it, none placebo-controlled, none longer than weeks, none by injection, and none replicated outside Russia. A 2021 review in the Journal of Clinical Pharmacology described it as poorly studied outside its country of origin. Selank acetate was placed in Category 2 of the FDA's 503A list in 2023 and removed on 27 September 2024 after the nominator said it had intended to nominate a different substance.

There is no study of Selank with a GLP-1, and no study of Selank for anxiety that started on a GLP-1. What can be said is that the two act on unrelated systems, no interaction is described, and the overlaps are early tiredness, feeling wired, and GLP-1 side effects that can feel like anxiety. The fuller pictures are in Selank side effects and tirzepatide side effects, and pairings in general are in what peptides can you take with tirzepatide.

1. Report new anxiety first. If it started with the GLP-1, your care team needs to know before anything is added.
2. List every medication. Especially psychiatric medication, stimulants, sedatives, insulin and sulfonylureas.
3. Start one thing at a time. Begin Selank away from a GLP-1 dose increase.
4. Report what happens, including nothing. Your care team is reachable through your account.

Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account.

1. Complete a free online intake covering your history, including mental health history, and every medication you take.
2. A physician licensed in your state reviews it, usually within 24 hours.
3. If it is appropriate, a PCAB-accredited, FDA-registered US 503A compounding pharmacy prepares it to that prescription. Lot test results are published at /quality/lab-results.
4. It ships refrigerated with ice packs, with sterile syringes and alcohol prep pads, and your directions printed on the vial.
5. Your care team stays reachable for side effects and mood changes. Refills run every 28 days, one vial per fill.

Pepti is cash-pay and does not bill insurance. Step-by-step pages: how to get Selank prescribed online and how to get tirzepatide prescribed online.