Drug & supplement interaction

Fat Smash Diet + Tasimelteon

Tasimelteon brand names: Hetlioz, Hetlioz Lq.

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 Fat Smash Diet and Tasimelteon 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

Fat Smash Diet and Tasimelteon

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 Tasimelteon and Fat Smash Diet in our sources. This does not guarantee that the combination is completely free of risk — research on Fat Smash Diet alongside specific medications may be limited.

Worth understanding: our licensed dataset holds no drug-interaction record for Fat Smash Diet at all — not against Tasimelteon, 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.

Fat Smash Diet is an eating pattern rather than something you take. Ask your pharmacist or doctor before changing how you eat while on a prescribed medicine: some medicines are dosed around meals, and a change in diet can change how they work. 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.

Fat Smash Diet safety at a glance

Fat Smash Diet overall Use caution It is a food-based diet plan, but very restrictive early phases may not suit everyone.
Pregnancy Use caution Restrictive dieting during pregnancy is not advised without medical supervision.
Breastfeeding Use caution Calorie restriction while breastfeeding should be discussed with your healthcare provider first.

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

Still wondering about combining Tasimelteon and Fat Smash Diet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Tasimelteon’s Own FDA Label Lists

This is not an interaction — none of it involves Fat Smash Diet. These are the most notable effects listed in the ADVERSE REACTIONS section of Tasimelteon’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 follow Fat Smash Diet and take the medicine. 2 of them are worth acting on rather than waiting out — marked below.

  • Liver problems Worth acting on
  • A higher chance of infection Worth acting on
  • Vivid dreams or nightmares mentioned in 8.5% of FDA reports for Tasimelteon
  • Trouble sleeping mentioned in 19.8% of FDA reports for Tasimelteon
  • Headache mentioned in 6.7% of FDA reports for Tasimelteon

From the ADVERSE REACTIONS section of the FDA label for Tasimelteon. Read the label on DailyMed › Where a percentage is shown, it is the share of 5,765 voluntary FDA FAERS reports for Tasimelteon that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Fat Smash Diet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Fat Smash Diet side to compare — that is a limit of the record, not a statement that Fat Smash Diet has no side effects.

Everything else you take

See Every Supplement That Interacts With Tasimelteon

This page covers Fat Smash Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tasimelteon page lists 218 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: 1,4-butanediol (major), Activated Charcoal (major), Beer (major), Gamma-hydroxybutyrate (ghb) (major) and Grapefruit (major).

By severity: 9 major · 166 moderate · 43 minor.

From our pharmacist’s overview on the Tasimelteon page

“Tasimelteon (Hetlioz) resets the body clock in people with non-24-hour sleep-wake disorder, and the sleep aids they often reach for, melatonin and kava among them, sit on an interaction list that deserves real respect. Nine of the 218 ingredients on file rate major, mostly in two directions: sedatives like kava stack drowsiness onto a…”

Reviewed by 2 · Jul 18, 2026

Open the Tasimelteon interaction page

How much people look this up

Where Fat Smash Diet and Tasimelteon 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 Fat Smash Diet
Steady interest

#1,337 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Tasimelteon
Steady interest

#1,475 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. Fat Smash Diet 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 Fat Smash Diet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Fat Smash Diet and Tasimelteon records this page draws on were last updated June 22, 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 .
Eating pattern

About Fat Smash Diet

What is Fat Smash Diet?

  • Weight loss
  • Building healthier eating habits
  • Reducing processed food intake
  • Jump-starting a lifestyle change

The Fat Smash Diet is a phased weight-loss eating plan, not a supplement or herb. It promotes whole foods, portion control, and gradual habit change, which can help some people lose weight, but it works best alongside regular exercise and long-term lifestyle changes. Talk with your doctor or a dietitian before starting any restrictive diet.

Structured eating plan (book, meal programs)

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

Fat Smash Diet: dosing

There is no pill, tea, or capsule dose for the Fat Smash Diet because it is an eating plan, not a supplement. "Dosing" instead means following the plan's phases and food guidelines.If you choose to try it, follow the instructions in the official book or program, and aim for balanced meals with enough protein, fiber, and nutrients. A registered dietitian can help you adjust the plan to your calorie needs and health goals.

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

Read the full Fat Smash Diet monograph & all interactions
Medication

About Tasimelteon

What Is Tasimelteon Used For?

Brand names: Hetlioz, Hetlioz Lq

Tasimelteon capsules are approved to treat Non-24-Hour Sleep-Wake Disorder (Non-24) in adults. Non-24 is a condition where the body's internal clock does not align with the normal 24-hour day, causing sleep and wake times to shift continuously.

Hetlioz capsules are also approved to treat nighttime sleep disturbances in Smith-Magenis Syndrome (SMS) in patients 16 years of age and older. Hetlioz LQ oral suspension is approved specifically for nighttime sleep disturbances in SMS in pediatric patients ages 3 to 15 years.

Most-Reported Side Effects for Tasimelteon

From FAERS, the FDA’s public side-effect reporting system (5,770 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Insomnia 728 reports
Middle insomnia 414 reports
Somnolence 408 reports
Headache 386 reports
Nightmare 268 reports
See full Tasimelteon drug information
Keep checking

Other Drugs & Fat Smash Diet

Browse every other medication we’ve checked against Fat Smash Diet — 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 Fat Smash Diet 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 Fat Smash Diet list.

See the full Fat Smash Diet interactions page
See every supplement checked against Tasimelteon, ranked by severity
Evidence & sources

Fat Smash Diet References

The 3 sources that drive our Fat Smash Diet monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Fat Smash Diet is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Weight-loss and Nutrition Myths — NIH NIDDK Source
  2. Choosing a Safe and Successful Weight-loss Program — NIH NIDDK Source
  3. Healthy Diet — MedlinePlus 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

Following Fat Smash Diet While Taking Tasimelteon: Common Questions

Is it safe to follow Fat Smash Diet while taking Tasimelteon?
We do not list a known interaction between Fat Smash Diet and Tasimelteon. 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 Tasimelteon interact with any supplements?
Yes. Tasimelteon has documented interactions with 218 supplements in our database — Fat Smash Diet is not one of them. The Tasimelteon 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

Fat Smash Diet monograph Uses, safety profile, and every drug interaction in one place Tasimelteon drug information The full plain-English guide to this medication Tasimelteon supplement interactions Every supplement checked against Tasimelteon, 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 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Tasimelteon and Fat Smash Diet?

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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.