Can You Take PE-22-28 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.

PE-22-28

PE-22-28 is a seven-amino-acid fragment of the sortilin propeptide, a piece clipped off when the body makes the sortilin receptor. It blocks TREK-1, a background potassium channel that helps set how easily a neuron fires. In rodents, blocking TREK-1 on serotonin neurons was associated with increased firing and antidepressant-like behaviour after a four-day course. There are no human trials. It is not described as acting on appetite, digestion or weight. See what is PE-22-28.

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 PE-22-28 because their mood dipped after starting a GLP-1. Pepti's references do not list anxiety or depression among tirzepatide's side effects. For semaglutide, a large 2024 Nature Medicine cohort of 240,618 people reported lower rates of new suicidal ideation than on other weight-management drugs, and the suicidal-behavior warning on the approved semaglutide weight-management label was removed in February 2026. But several physical GLP-1 effects can feel like low mood or anxiety.

Describe exactly what you feel and when, so your care team can tell these apart. Adding PE-22-28 to treat what is actually under-eating or low blood sugar would miss the cause, and PE-22-28 has never been tested for mood in a person. More is in GLP-1 anxiety and depression.

Cell work described the parent peptide of PE-22-28 increasing insulin secretion from pancreatic beta cells (Journal of Diabetes Research, 2016). Nobody has measured that in people taking PE-22-28. Tirzepatide on its own rarely causes low blood sugar, but the risk rises with insulin or a sulfonylurea.

Know the signs of low blood sugar: shakiness, sweating, a fast heartbeat, confusion. Treat it first, then report it. Never change an insulin or sulfonylurea dose on your own.

Starting both in the same week makes tiredness, headache and mood changes impossible to place. Starting one thing at a time is simpler.

PE-22-28's proposed mechanism overlaps with serotonin signalling. If you take an antidepressant, a triptan, lithium, tramadol or any other serotonergic drug, or have been diagnosed with major depression, bipolar disorder or psychosis, that treatment comes first, and any decision about PE-22-28 involves the clinician managing it. The combination has never been studied in people. Never stop or reduce a psychiatric medication to make room for PE-22-28 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 PE-22-28. An active eating disorder is a situation where a GLP-1 is usually avoided; say so on the intake if it applies.

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 PE-22-28 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 effects that can feel like low mood are the same kind: fatigue in the early weeks, dizziness, and low blood sugar with insulin or a sulfonylurea. Semaglutide and tirzepatide are never taken together. See semaglutide side effects.

There are no human trials of PE-22-28 of any kind. Its evidence is cell and rodent work, mostly from one French research group, and the only human data in the area measures the body's own sortilin propeptide in blood. PE-22-28 has not been evaluated by the FDA at all: it is not in any category of the 503A nominated-substances list updated 14 May 2026 and was not on the July 2026 advisory committee agenda.

There is no study of PE-22-28 with a GLP-1. What can be said is that the two act on unrelated systems, no interaction is described, and the overlaps worth managing are early tiredness, injection-site reactions, mood changes that need reporting, and blood sugar for people on insulin or a sulfonylurea. The fuller pictures are in PE-22-28 side effects and tirzepatide side effects, and pairings in general are in what peptides can you take with tirzepatide.

1. Report a mood change first. If it started with the GLP-1, your care team needs to know before anything is added.
2. List every medication. Especially antidepressants, triptans, lithium, tramadol, insulin and sulfonylureas.
3. Start one thing at a time. Begin PE-22-28 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, diabetes, 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 PE-22-28 prescribed online and how to get tirzepatide prescribed online.