The rows, label by label
The US label’s Table 1 lists reactions that reached 5% in five placebo-controlled trials and were more frequent than on placebo. Back pain qualifies at 5% on 1.8 mg, one point above the 4% on 1.2 mg and two above the 3% on placebo. [1] Muscle and joint pain do not appear. [1] The European summary of product characteristics has no musculoskeletal entries for Victoza® at all. [2] The Canadian monograph gives each trial separately, counting every event above 1% whatever its cause, which lets you see how close the figures are to the comparison groups. [3]
| Source and term | Victoza® 0.6 mg | 1.2 mg | 1.8 mg | Comparison group |
|---|---|---|---|---|
| US label, Table 1: back pain [1] | — | 4% | 5% | Placebo 3% |
| Canada, LEAD-2 (with metformin): back pain [3] | 2.9% | 2.1% | 2.5% | Placebo 3.3%; glimepiride 3.7% |
| Canada, LEAD-2: myalgia (muscle pain) [3] | 0.4% | 1.3% | 1.7% | Placebo 1.7%; glimepiride 1.7% |
| Canada, LEAD-2: arthralgia (joint pain) [3] | 2.5% | 0.0% | 1.2% | Placebo 2.5%; glimepiride 2.9% |
| Canada, LEAD-2: pain in a limb [3] | 0.0% | 0.8% | 2.9% | Placebo 0.8%; glimepiride 0.8% |
| Canada, trial 1860 (with metformin): back pain [3] | — | 3.6% | 3.7% | Sitagliptin 4.6% |
| Canada, trial 1860: myalgia [3] | — | 0.0% | 1.8% | Sitagliptin 2.3% |
| Canada, LEAD-3 (52 weeks, alone): back pain (events over 5%) [3] | — | 5.6% | 4.5% | Glimepiride 4.4% |
| EU SmPC, Table 1 [2] | No musculoskeletal entries |
How much weight to give the back pain row
The US difference is small and the Canadian trials do not repeat it consistently: back pain was slightly lower than placebo in LEAD-2, slightly higher in LEAD-5 (3.0% against 2.6%), lower than sitagliptin in trial 1860 and similar to glimepiride in LEAD-3. [3] Muscle pain and joint pain were no more frequent on Victoza® than on placebo or other medicines in these tables. [3] The one row that rises with dose in LEAD-2 is pain in a limb, from 0% to 2.9%, but trial 1860 does not show the same pattern against sitagliptin (1.8% on 1.8 mg against 2.3%). [3]
Put simply, the product information supports back pain as a small, listed signal and does not support muscle or joint pain as a Victoza® reaction. Canada lists a slipped or bulging spinal disc among less common trial events, without a rate. [3]
When back pain is really belly pain
The Victoza® label asks prescribers to watch for acute pancreatitis after starting treatment. Its characteristic sign is persistent or severe pain in the abdomen that can run through to the back, with or without nausea and vomiting. [1] The Medication Guide tells you to stop Victoza® and call your provider at once if that happens. [1] The warning pain, in other words, starts in the stomach area and does not go away; a back that aches on its own is a different picture. [1]
Other links the label supports, and one it does not
- Injection site. Canada reports injection site reactions in about 2% of people in long-term trials, most often bruising and pain. [3] EU product information lists injection site reactions as common. [2]
- Fluid loss. The label warns that vomiting and diarrhea can cause dehydration and kidney injury. [1] MedlinePlus lists muscle cramps among signs of mild to moderate dehydration. [8]
- Safety reports. A 2026 analysis of US spontaneous reports for incretin-based diabetes medicines found back pain and muscle pain signals for GLP-1 medicines as a group, with a median onset of 30 days or less, and differences by sex, age and weight for liraglutide among others. Such reports show association, not cause, and cannot give a rate. [4]
- Not supported: no Victoza® source describes muscle damage or loss of muscle mass as a reaction, so claims of that kind do not come from its product information. [1][2][3]
Common causes in people with diabetes and heart risk
MedlinePlus says most muscle pain comes from overuse, injury or tension, and that whole-body aches can come from infections such as flu. [5] It also names medicines: statins for cholesterol and ACE inhibitors for blood pressure. [5] Both are common in people prescribed Victoza®; in LEADER, 72.1% of participants used a statin and 92.4% used blood pressure medicines other than diuretics. [1] MedlinePlus asks you to contact your provider if muscle pain begins after starting or changing a medicine such as a statin. [5]
For joints, MedlinePlus lists osteoarthritis, gout, bursitis, tendinitis, viral infections and overuse. [6] Back pain affects most adults at some point, and most acute episodes settle over days to weeks. [7]
What the sources describe for relief
For muscle pain from overuse, MedlinePlus describes rest, ice in the first days and heat afterwards, gentle stretching, massage, plenty of sleep and gradually rebuilding regular activity such as walking, cycling or swimming. [5] For joint pain without arthritis it mentions warm baths, massage and stretching. [6] For back pain it notes that resting in bed for more than a day or two can make things worse. [7] MedlinePlus names over-the-counter pain relievers in these pages; with diabetes, kidney concerns and other medicines, ask a pharmacist or your prescriber which one suits you.
The Victoza® Medication Guide also asks you to drink fluids to reduce the chance of dehydration when stomach side effects occur. [1]
Victoza® is a registered trademark of Novo Nordisk A/S. PepLabo is not affiliated with or endorsed by Novo Nordisk A/S.
When to get help
| Sign | Who to contact | How fast | Source |
|---|---|---|---|
| Severe stomach pain that will not go away and spreads to the back, with or without vomiting | Stop Victoza® and call your prescriber right away | Emergency | Medication Guide [1] |
| Muscle pain with weakness, being unable to move part of the body, passing less urine than usual, shortness of breath or trouble swallowing | Emergency services (911 or local number) | Emergency | MedlinePlus [5] |
| Muscle cramps with vomiting or diarrhea that does not stop, or very dark urine | Your prescriber, the same day | Today | Medication Guide [1]; MedlinePlus [8] |
| Muscle pain that started after beginning or changing a medicine such as a statin | Contact your provider | At your next appointment | MedlinePlus [5] |
| Muscle pain lasting more than three days, joint pain lasting several days, or a red, swollen joint | Contact your provider | At your next appointment | MedlinePlus [5][6] |
| Back pain that is severe or not improving after three days, or after an injury | Call your health care provider | At your next appointment | MedlinePlus [7] |
