Drug & supplement interaction

Prolotherapy + Orlistat

Orlistat brand names: Xenical, Alli.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Prolotherapy and Orlistat in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Prolotherapy and Orlistat

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Orlistat and Prolotherapy in our sources. This does not guarantee that the combination is completely free of risk — research on Prolotherapy alongside specific medications may be limited.

Worth understanding: our licensed dataset holds no drug-interaction record for Prolotherapy at all — not against Orlistat, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

Prolotherapy is a treatment rather than something you take. Tell whoever provides it which medicines you use, and ask your prescriber whether it is appropriate for your health and treatment. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Prolotherapy safety at a glance

Prolotherapy overall Use caution Generally considered low-risk when performed by a trained clinician, but it is an invasive injection with possible side effects.
Pregnancy Avoid Not recommended during pregnancy due to lack of safety data and the use of injections and anesthetics.
Breastfeeding Use caution Safety has not been well studied; discuss with your doctor before considering it.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Orlistat and Prolotherapy? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Orlistat’s Own FDA Label Lists

This is not an interaction — none of it involves Prolotherapy. These are the most notable effects listed in the ADVERSE REACTIONS section of Orlistat’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you have Prolotherapy and take the medicine. 10 of them are worth acting on rather than waiting out — marked below.

  • Bleeding in the gut Worth acting on
  • Low blood sugar Worth acting on
  • Pancreatitis Worth acting on
  • Wheezing Worth acting on
  • Low mood Worth acting on
  • A severe allergic reaction Worth acting on
  • Hives Worth acting on
  • Liver problems Worth acting on
  • Bleeding or bruising Worth acting on
  • A higher chance of infection Worth acting on

Showing the 10 most notable of 28 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Orlistat. Read the label on DailyMed › Where a percentage is shown, it is the share of 25,755 voluntary FDA FAERS reports for Orlistat that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Prolotherapy’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Prolotherapy side to compare — that is a limit of the record, not a statement that Prolotherapy has no side effects.

Everything else you take

See Every Supplement That Interacts With Orlistat

This page covers Prolotherapy only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Orlistat page lists 18 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Fish Oil (moderate) and Glucomannan (moderate).

By severity: 1 major · 8 moderate · 9 minor.

From our pharmacist’s overview on the Orlistat page

“People who take Orlistat (Xenical, Alli) for weight loss often browse the very supplement aisle where fiber products and fish oil sit, and both show up on this page, so it deserves genuine attention before you mix anything in. Nearly all 18 ingredients on file can change how oral medications absorb from the gut, and the single major-ra…”

Reviewed by 2 · Jul 18, 2026

Open the Orlistat interaction page

How much people look this up

Where Prolotherapy and Orlistat Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Prolotherapy
Steady interest

#823 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Orlistat
Top 25%

#442 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions. Prolotherapy is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Prolotherapy reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Prolotherapy and Orlistat records this page draws on were last updated June 20, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Treatment approach

About Prolotherapy

What is Prolotherapy?

  • Chronic low back pain
  • Knee osteoarthritis
  • Tendon and ligament pain
  • Joint instability
  • Tennis elbow and other tendinopathies

Prolotherapy is not a dietary supplement or herb; it is an injection procedure in which an irritant solution (usually dextrose) is injected near painful joints, tendons, or ligaments to encourage a healing response. The evidence is mixed and generally low-to-moderate quality, with some studies showing modest pain relief for conditions like knee osteoarthritis and chronic low back pain. It should only be done by a trained, licensed clinician, so talk with your doctor before considering it.

Not applicable (a medical injection procedure) · Injected solution, most often dextrose (sugar water) mixed with a local anesthetic

An interaction check asks whether these two react with each other — it does not ask whether Prolotherapy is a good idea for someone in your situation. Here is what our Prolotherapy record says about it on its own.

Prolotherapy: dosing

There is no single standard dose or protocol for prolotherapy. The type of solution (most often dextrose), the concentration, the amount injected, the number of injection sites, and how many sessions are needed all vary based on the clinician, the body area, and the condition being treated.Treatment is usually given as a series of sessions spaced a few weeks apart.

From our Prolotherapy monograph — the full record covers uses, side effects and every documented interaction.

Read the full Prolotherapy monograph & all interactions
Medication

About Orlistat

What Is Orlistat Used For?

Brand names: Xenical, Alli

Xenical and prescription-strength orlistat are approved to help obese adults lose weight and keep it off when used with a reduced-calorie diet. They are intended for people with a body mass index (BMI) of 30 or higher, or 27 or higher if other risk factors such as high blood pressure, diabetes, or dyslipidemia (abnormal cholesterol or fat levels in the blood) are present.

Alli is the over-the-counter version, approved for weight loss in overweight adults 18 and older when used with a reduced-calorie, low-fat diet and exercise program.

Most-Reported Side Effects for Orlistat

From FAERS, the FDA’s public side-effect reporting system (25,755 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Rectal discharge 2,434 reports
Gastrointestinal disorder 2,186 reports
Constipation 1,991 reports
Diarrhea 1,960 reports
Weight increased 1,944 reports
See full Orlistat drug information
Keep checking

Other Drugs & Prolotherapy

Browse every other medication we’ve checked against Prolotherapy — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Prolotherapy against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Prolotherapy list.

See the full Prolotherapy interactions page
See every supplement checked against Orlistat, ranked by severity
Evidence & sources

Prolotherapy References

The 1 sources that drive our Prolotherapy monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Prolotherapy is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Pain Management — NIH NCCIH Source

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Having Prolotherapy While Taking Orlistat: Common Questions

Is it safe to have Prolotherapy while taking Orlistat?
We do not list a known interaction between Prolotherapy and Orlistat. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Does Orlistat interact with any supplements?
Yes. Orlistat has documented interactions with 18 supplements in our database — Prolotherapy is not one of them. The Orlistat interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Prolotherapy monograph Uses, safety profile, and every drug interaction in one place Orlistat drug information The full plain-English guide to this medication Orlistat supplement interactions Every supplement checked against Orlistat, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Orlistat and Prolotherapy?

Our pharmacists answer your medication & supplement questions — free.

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.