[Health Column] Vision Loss After Wigobi or Maunzaro? Signals Not to Be Missed in Side Effect Management
hello, Director Ahn Hyun-ji of Gangnam FM Clinic no see.
I am taking weight loss medication, and I am worried after seeing the news about vision loss.
As suspected cases of vision impairment following the use of obesity medication were addressed during the recent parliamentary audit, the number of people asking whether they should continue treatment has increased significantly. In the clinic as well, I frequently receive questions asking, "Do I need to stop the medication I am currently taking immediately?"
When assessing safety Adverse events that occurred after drug use and Side effects with a confirmed causal relationship You must distinguish between the two. They are different concepts, but they are often grouped together in the media. You cannot conclude that all symptoms occurring while taking a medication are due to it, and conversely, rare but clearly confirmed side effects should not be taken lightly.
Today, among the side effects of Wigobi and Maunzaro Changes requiring immediate medical attention Wow, I will summarize and explain the points we check together during the consultation while continuing the treatment.
💡 The key to managing side effects is Not 'enduring,' but 'notifying on time' is. Especially Sudden loss of vision and Severe abdominal pain spreading to the back It is not a symptom that you should wait until your next appointment.
🩺 Do both Wigobi and Maunzaro cause vision damage?
The two drugs are often referred to by their names, but they have different ingredients. The active ingredient in Wigobi is semaglutide , The active ingredient of Maunzaro is tyrzepatide no see.
The European Medicines Agency lists 'non-arteritic anterior ischemic optic neuropathy' as a very rare side effect of semaglutide, that is NAION It was acknowledged. It is a condition in which vision is impaired due to insufficient blood supply to the optic nerve. The expression 'very rare' is important here. It means that while it does not occur frequently, it is classified as a side effect that requires verification when it does occur.
And this judgment It cannot be applied directly to tyrzepatide as well. This is because safety assessments are conducted separately for each ingredient if the ingredients differ. Generalizations such as "all obesity treatments are dangerous to the eyes" are inaccurate.
However, no matter which medicine you use Sudden vision loss must be checked promptly. If your vision is partially obscured or eyesight deteriorates rapidly, seek immediate medical attention from an ophthalmologist or emergency specialist, even if you experience no pain. Since eye function can decline without pain, it is easy to delay treatment simply because there is no discomfort. If NAION is detected while using semaglutide, discontinuation of the medication is recommended. Do not dismiss this as mere fatigue or adaptation symptoms.
🩺 What should I disclose before a prescription to reduce the risk of side effects?
Although not all side effects can be prevented, Identifying risk factors in advance changes your range of choices. So, there are more things checked during the first consultation than you might think.
In medical consultations, not only current weight Comorbidities, medications, and discomfort experienced during previous treatment Check this. If there is a reason why you previously used and discontinued another obesity treatment, that experience serves as the starting point for this prescription.
History of pancreatitis or gallbladder disease, pre-existing eye disease, pregnancy planning We also need to let people know. Especially diabetic retinopathy or Insulin and some diabetes medications Those who use this concurrently require management that takes into account eye condition and the risk of hypoglycemia. Since the process of rapid blood sugar control itself can affect the eyes, it is safer for such individuals to monitor their eye condition before and after the prescription.
After starting treatment You need to review the current status again before increasing the capacity. Gangnam FM Clinic monitors appetite, food intake, and gastrointestinal symptoms through weekly consultations with medical staff and progress checks.
but Consulting every week does not mean increasing the dosage every week. We adjust prescriptions based on response and tolerability while adhering to the approved dosage increase intervals for each drug. Frequent consultations are conducted not to raise the dosage quickly, but to frequently verify whether the patient is in a condition suitable for such an increase.
🩺 How long can I wait and see about nausea or constipation?
Nausea, vomiting, diarrhea, and constipation are gastrointestinal symptoms that may occur during treatment. Many people ask, “Do I have to endure this?” What is more important than the name of the symptom is the extent to which one can eat and drink. no see.
If repeated vomiting makes it difficult to keep water, or if urine output decreases and you feel dizzy Dehydration You need to check for persistent severe abdominal pain, especially Pain spreading to the back Prompt medical attention is also required.
Even if there is minor inconvenience When did it start after the dosage increase, and what effect did it have on diet and bowel movements? Please let me know. Even if it is the same 'nausea,' the response differs depending on whether it is only for a few days immediately after increasing the dosage or persists for more than two weeks.
FM Clinic monitors dietary composition and fluid intake, and delays dosage increases or adjusts prescriptions if necessary. GUT IV fluids may be considered if replacement is required after the consultation.
🩺 If I've lost weight but have no energy, is the medicine working well?
If you look only at the numbers on the scale, it seems like the treatment is going well, but How it decreased You need to check this separately.
If you lose your appetite and keep skipping meals, along with weight loss undernourishment This may occur. If you find it difficult to climb stairs or feel that your usual activities have become burdensome, you should examine your food intake and body composition. However, All fatigue cannot be concluded to be muscle loss, and You must also check for other causes, such as dehydration or hypoglycemia. This is because what needs to be done varies completely depending on the cause.
FM Clinic's nutritional counseling is not only about how to eat less How to ensure you get the necessary nutrients It covers [this]. It adjusts protein, fluid, and activity levels per meal and monitors changes in body composition. Depending on the condition, prescriptions such as ABC and MIC can be reviewed.
💡 Things to write down before your appointment
· Date of administration and current dose
· Time when symptoms started (whether before or after the dosage increase)
· Frequency of vomiting and changes in bowel movements
· Amount eaten and drunk per day
· Changes felt in the field of vision or eyesight
It is most important not to hide your symptoms out of fear that your weight loss might stop.
💬 Frequently Asked Questions (FAQ)
Q1. Should I stop taking the medication immediately just by seeing news about vision loss?
A1. If you have no symptoms, review your medical history and the need for treatment with your prescribing physician rather than deciding to stop based solely on reports. If you experience sudden changes in vision, do not wait for a consultation appointment; seek medical attention immediately.
Q2. If there are no side effects, can I increase the dosage quickly?
A2. Do not reduce the dose escalation interval solely on the grounds that there is no discomfort. The decision is made based on the approved schedule, appetite, food intake, and treatment response.
Q3. What should I record before the appointment?
A3. Please record the date and dosage of administration, the time symptoms began, the frequency of vomiting and changes in bowel movements, and the amount of food and drink consumed. It is also important not to hide symptoms out of fear that the weight reduction will be stopped.
Q4. Can I not use obesity medication if I have an eye condition?
A4. Having a pre-existing eye condition does not mean it cannot be used uniformly. However, since there are cases, such as diabetic retinopathy, where the eye condition must be examined, please be sure to inform us of your medical history before prescribing, and we will conduct an ophthalmological evaluation if necessary.
Q5. Will reducing my food intake help when I have nausea?
A5. Please inform them first rather than having them reduce their food intake on their own. Reducing food and water intake can lead to dehydration and nutritional deficiencies, so it is safer to check their food composition and fluid intake and, if necessary, postpone increasing the dosage or adjust the prescription.
🎯 To summarize
It is not possible to prevent all side effects of obesity medications. However If you identify risk factors before prescribing and share changes during treatment You can determine necessary measures more quickly.
Wigobi and Maunzaro are medications with different active ingredients, and safety information varies by ingredient. Rather than making a judgment based on a single news report, it is more accurate to consult with a medical professional to review the information based on the medications you are currently taking and your medical history.
FM Clinic's managed diet program monitors not only weight loss speed but also nutritional status, lifestyle habits, and maintenance after weight loss. Please let us know of even minor discomforts during regular consultations. Sudden vision loss and persistent severe abdominal pain are not symptoms to wait until the next medical appointment.
💡 This column is for general informational purposes only and does not replace individual diagnosis or prescription. Wigobi and Maunzaro are prescription medications, and you must consult with your prescribing physician to determine whether to administer them and the dosage.
Gangnam FM Clinic
Director Ahn Hyun-ji
Graduated from Seoul National University
Graduated from medical school
Completed internship, residency, and clinical fellowship at Asan Medical Center
Served as an adjunct professor at Seoul Asan Hospital
Obesity specialist certified by the Korean Society of Obesity
Current Chief Director of Gangnam FM Clinic
· European Medicines Agency (EMA), results of safety review of semaglutide and NAION, June 6, 2025.
· U.S. National Library of Medicine DailyMed, MOUNJARO Prescription Information — Precautions regarding gastrointestinal adverse reactions, dehydration, pancreatitis, and diabetic retinopathy.
· MBC, report on parliamentary audit regarding suspected cases of vision impairment after use of obesity treatment drugs, October 13, 2026.
마운자로 후 주의사항, 뭐가 있을까?
👉 관련 진료 정보 보러가기Obesity treatment that considers body composition and diet
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