GLP-1 TV · Patient story · views checked Oct 2026
MOUNJARO FOR WEIGHT LOSS | Week 5, 1st dose of 5 MG | New Symptoms?!
Patient story
Our summary
Brittany Rose, who posts as Brittany Rose GLP1, covers her first week on the 5 MG dose of Mounjaro, which is week 5 of her treatment. She says she took the shot on a Thursday night and felt normal for the first day. By Friday evening she was very tired and had aches in her upper arms, shoulders and lower back. She says this lasted until the following Monday. She also reports feeling much fuller than before, a headache on Saturday, and a return of some appetite.
One person's experience, in their words. Not medical advice.
Where tirzepatide costs least today
The three cheapest partner programs for tirzepatide, all in per month, checked weekly. Brand Mounjaro and compounded versions are different products; each row says which it is.
What else the video covers
She links the rough week to two changes made on the same day: raising the dose to 5 MG and stopping Phentermine. According to her, her doctor told her it was probably not a good idea to do both at once. He advised her to resume Phentermine until her body adjusted to 5 MG, keep taking it through the second week at that dose, then taper off over a few days. She says that after restarting it, her energy returned and the aches and extra hunger went away. She also describes alternating constipation and diarrhea, and says she takes Colace twice a day.
She responds to commenters who object to taking Phentermine alongside Mounjaro, saying she trusts her doctor's opinion. She reports losing 1.8 pounds this week, bringing her total to exactly 20 pounds down in five weeks. The video also includes short daily clips of her meals and symptoms. She asks viewers to share their own experiences when changing doses. These are her personal experiences, not medical advice.
Our summary of what is said, in our words. Doses, results and prices are the speaker’s, not advice.
Takeaways
The main points, in the order they come up. Tap a time to play from there.
- 0:04 She reports a headache, fullness after eating half a burrito, and extreme tiredness and back aches over the first four days on 5 MG.
- 0:31 She says she felt much fuller than at any earlier point the morning after her first 5 MG shot, and had a slight headache.
- 5:37 She says the fatigue and muscle aches began on the Friday evening after the shot and lasted until Monday.
- 6:41 She says her doctor told her that raising the dose and stopping Phentermine on the same day was likely a poor idea, and advised resuming it.
- 9:05 She describes alternating constipation and diarrhea, and says she takes Colace twice a day.
- 13:17 She reports losing 1.8 pounds this week, for a total of exactly 20 pounds in five weeks.
Key moments
Where the talk turns, found in the captions. Tap one to play from there.
What the video says
As stated in the video, not checked by us. Doses and results are the speaker’s, not advice.
- Medication
- Mounjaro
- Doses mentioned
- 5 mg
- Point in the journey
- Week 5
- Side effects mentioned
- constipation, diarrhea, fatigue and headache
- Who is speaking
- Patient
Questions this video answers
What side effects did she have on the first week of 5 MG Mounjaro?
She reports a headache, feeling very full, extreme tiredness, and aches in her arms, shoulders and lower back. She says these started about a day after the shot and lasted until the following Monday. She also notes some mix of constipation and diarrhea.
Why did she restart Phentermine while on Mounjaro?
She says she felt awful after raising to 5 MG and stopping Phentermine on the same day. Her doctor told her that combining the two changes was likely the cause. He advised her to resume it, continue through the second week at 5 MG, then taper off.
How much weight did she lose in five weeks on Mounjaro?
She says she lost 1.8 pounds in the week after starting 5 MG. She adds that this brought her to exactly 20 pounds lost in five weeks, after 18.2 pounds the week before.
Videos on the same question
The closest videos in the library by what is said in them, not by title.
MOUNJARO FOR WEIGHT LOSS | Week 9 7.5 mg | New Dose, New SymptomsBrittany Rose gives her update for the first week on the 7.5 mg dose of Mounjaro, which she describes as very different from her earlier doses.
Mounjaro for Weight Loss week 1 | I’m SHOCKED at how much I lost!Brittany, who runs the Brittany Rose GLP1 channel, records her first week of taking Mounjaro together with Phentermine for weight loss.
MOUNJARO | 1 Month Weight loss check-in! 🩷Jennifer, who posts as Jenny Inspire, reviews her first month on Mounjaro at the 2.5 milligram dose.
When I Increased My Dose Of Mounjaro/Zepbound | 80lbs Down in 1 YearJenelle Ketcham walks through the dose-by-dose history of her first year on Mounjaro/Zepbound, which she says ended with 80 pounds lost.
Mounjaro Update: 5mg 2nd DoseThe creator of the Drunk on Mounjaro channel gives an update after taking their second 5mg dose of Mounjaro.
About Brittany Rose GLP1
Patient story, 44.3K subscribers. 27 of their videos are in GLP-1 TV, 1.1M views between them, mostly on Mounjaro, Zepbound, Wegovy.
- I’ve lost 115 lbs in a GLP1- I eat these meals on REPEAT. HIGH PROTEIN AND FIBER
- WHAT TO EXPECT MONTHS 1-3 ON A GLP1
- Mounjaro for Weight Loss week 1 | I’m SHOCKED at how much I lost!
Read next
Our guides closest to what this video covers, with prices checked weekly.
- Mounjaro side effects: the label's numbers by dose, the low blood sugar risk, and how tirzepatide compares at weight-loss doses
On Mounjaro's own label, the common side effects are stomach ones and they rise with the dose: nausea in 12, 15 and 18 percent of people at 5, 10 and 15 mg against 4 percent on placebo, diarrhea 12 to 17 against 9, and any gastrointestinal reaction in 37 to 44 percent against 20. Most of it happens while the dose is being raised and fades. Low blood sugar is rare on Mounjaro alone and is mainly a risk when it is added to insulin or a sulfonylurea. Below: the full table, the rare warnings, and why Zepbound's numbers for the same molecule look higher.
- Mounjaro dosage chart: the label's schedule, every pen and vial, and what each dose costs
Mounjaro starts at 2.5 mg injected once a week. If more blood sugar control is needed, the dose goes up in 2.5 mg steps after at least four weeks on the current dose, to a maximum of 15 mg a week for adults and 10 mg for children 10 and older. Lilly sells every strength self-pay starting at $499 a month, so on the brand the price does not climb with the dose.
- Mounjaro for weight loss, and why Zepbound exists
Mounjaro is tirzepatide approved for type 2 diabetes. Zepbound is the same molecule from the same maker, approved for weight management, and it goes to the same 15 mg. So unlike Ozempic and Wegovy, there is no dose ceiling pushing you from one to the other: the reason people move is coverage and cash price, not strength. Using Mounjaro for weight is off-label and a prescriber's decision. In the one head-to-head trial, tirzepatide beat semaglutide, 20.2% mean body-weight loss at 72 weeks against 13.7%.
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