Saxenda for weight loss: what TikTok gets right and wrong

What did @therealblackamber26 actually say?

The creator is documenting a Saxenda (liraglutide) journey at the 1.8 mg dose, around week three of that specific dose and roughly two months and two-plus weeks overall. The headline claim is losing 17 pounds total in that window. She also describes significant constipation, trying magnesium citrate, prune juice, and soluble fiber, and credits dairy consumption as likely worsening her GI issues. Toward the end, she mentions getting lightheaded when moving too fast, which she leaves unexplained.

She is careful to say her results come from "minimal exercise, minimal diet change" and genuinely credits the medication. She also notes that since moving to 1.8 mg she has been eating cleaner by default because heavier foods are harder to tolerate, which is actually a meaningful clinical observation. She does not claim Saxenda cures anything and actively tells viewers to contact their doctor with concerns.

Does the science back this up?

The 17-pound loss over roughly 10-11 weeks is plausible but on the higher end of what trials document at this stage of titration. Constipation as a GI side effect is well-documented. The lightheadedness, however, deserves more attention than she gives it.

The SCALE Obesity and Prediabetes trial (Pi-Sunyer et al., 2015, NEJM) showed liraglutide 3.0 mg produced roughly 8% body weight loss over 56 weeks in non-diabetic adults, with the bulk of early loss driven by appetite suppression and reduced caloric intake. Hitting 17 lbs in under 3 months is possible, especially with a higher starting weight or significant water weight changes, and she explicitly notes magnesium citrate may have pulled 2-3 lbs of that. Constipation with GLP-1 receptor agonists is less commonly reported than nausea but real: a 2022 review (Smits and Van Raalte, Drugs) confirmed GI motility slowing as a class effect. Her magnesium citrate approach is a clinically reasonable osmotic laxative option, though not a first-line recommendation without provider guidance.

What did they get wrong (or right)?

She gets more right than wrong, but there are two things worth flagging directly. First, attributing 2-3 pounds of weight loss to a magnesium citrate purge is not fat loss. It is stool and water weight. Counting it in her total and then weighing herself the next day introduces real measurement error, and viewers tracking their own progress this way will be misled.

Second, the lightheadedness she describes, "like I'm about to pass out," when moving quickly is consistent with orthostatic hypotension, which has been reported in GLP-1 receptor agonist users, sometimes linked to volume depletion from reduced food and fluid intake. She brushes this off. That is the wrong call. A 2023 pharmacovigilance analysis (Drucker, Cell Metabolism) flagged postural symptoms as an underreported adverse event in this drug class, and anyone experiencing near-syncope should be telling their prescriber, not hoping it resolves by the time they start working out.

On the positive side, her intuition that dairy is worsening her constipation is reasonable. Dairy can slow GI transit independently of the drug, and her self-observation lines up with basic GI physiology.

What should you actually know?

If you are on Saxenda or any GLP-1 receptor agonist and experiencing near-fainting episodes, tell your prescriber before increasing activity. Do not wait for a month milestone. This is the most important thing in this video that the creator underplays.

On the weight loss itself, Saxenda is currently approved at a maximum dose of 3.0 mg daily for chronic weight management. The titration schedule exists specifically to reduce GI side effects, so where someone is on that schedule matters clinically. Early weight loss is often partly fluid and GI-related, not purely fat mass, which is why weekly weigh-ins after laxative use are noisy data. For constipation, the clinical toolkit includes increased hydration, soluble fiber supplementation, osmotic laxatives like polyethylene glycol (Miralax) as a first-line option, and dietary adjustments. Magnesium citrate is generally safe short-term but is typically reserved for more acute situations. Sustained constipation on a GLP-1 medication is a conversation to have with a provider, not just a problem to self-manage with grocery store remedies.

Finally, the hashtag mix of both liraglutide and semaglutide in this video could confuse viewers. These are different molecules with different dosing, approval statuses, and side effect profiles. They are not interchangeable.