Drug & supplement interaction

Fat Smash Diet + Dextromethorphan, Guaifenesin, Phenylephrine

Dextromethorphan, Guaifenesin, Phenylephrine brand names: Albatussin Sr, Giltuss.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Fat Smash Diet and Dextromethorphan, Guaifenesin, Phenylephrine 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 Dextromethorphan, Guaifenesin, Phenylephrine

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 Dextromethorphan, Guaifenesin, Phenylephrine 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 Dextromethorphan, Guaifenesin, Phenylephrine, 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 Dextromethorphan, Guaifenesin, Phenylephrine and Fat Smash Diet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Everything else you take

See Every Supplement That Interacts With Dextromethorphan, Guaifenesin, Phenylephrine

This page covers Fat Smash Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Dextromethorphan, Guaifenesin, Phenylephrine page lists 197 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Ephedra (major), Grapefruit (major), Lithium (major) and Peyote (major).

By severity: 8 major · 148 moderate · 41 minor.

From our pharmacist’s overview on the Dextromethorphan, Guaifenesin, Phenylephrine page

“A combination cough medicine like dextromethorphan, guaifenesin, and phenylephrine (Albatussin Sr, Giltuss) deserves real care around supplements, not casual mixing. Of the 197 ingredients with an interaction on file, 8 carry a major rating, and those are the ones to understand first.”

Reviewed by 2 · Jul 18, 2026

Open the Dextromethorphan, Guaifenesin, Phenylephrine interaction page

How much people look this up

Where Fat Smash Diet and Dextromethorphan, Guaifenesin, Phenylephrine 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

#1,396 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Dextromethorphan, Guaifenesin, Phenylephrine
Top half

#903 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 13, 2026. The Fat Smash Diet and Dextromethorphan, Guaifenesin, Phenylephrine 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
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 Dextromethorphan, Guaifenesin, Phenylephrine, 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 Dextromethorphan, Guaifenesin, Phenylephrine: Common Questions

Is it safe to follow Fat Smash Diet while taking Dextromethorphan, Guaifenesin, Phenylephrine?
We do not list a known interaction between Fat Smash Diet and Dextromethorphan, Guaifenesin, Phenylephrine. 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 Dextromethorphan, Guaifenesin, Phenylephrine interact with any supplements?
Yes. Dextromethorphan, Guaifenesin, Phenylephrine has documented interactions with 197 supplements in our database — Fat Smash Diet is not one of them. The Dextromethorphan, Guaifenesin, Phenylephrine 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 Dextromethorphan, Guaifenesin, Phenylephrine supplement interactions Every supplement checked against Dextromethorphan, Guaifenesin, Phenylephrine, 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 Dextromethorphan, Guaifenesin, Phenylephrine 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.