What You Need to Know About Octreotide Side Effects

If you've been prescribed Octreotide (brand names Sandostatin, Sandostatin LAR Depot, or Mycapssa), knowing what side effects to expect — and which ones are serious — can help you feel more prepared and in control of your treatment. Like any medication, Octreotide comes with potential side effects, but most are manageable with the right approach.

This guide covers common and serious side effects based on FDA labeling, who may be at higher risk, and practical tips for managing symptoms.

What Is Octreotide?

Octreotide is a somatostatin analog — a synthetic version of a natural hormone that regulates several body functions. It's FDA-approved for treating acromegaly (excess growth hormone), carcinoid syndrome (flushing and diarrhea from neuroendocrine tumors), and VIPomas (tumors causing severe watery diarrhea). You can learn more in our complete guide: What Is Octreotide?

Octreotide comes in several forms: subcutaneous injections (immediate-release), intramuscular LAR Depot injections (given monthly), and Mycapssa oral capsules. Side effects can vary somewhat depending on the formulation and dose.

Common Side Effects of Octreotide

The most frequently reported side effects are gastrointestinal. Many patients experience some of these, especially in the first few weeks of treatment. They often improve as your body adjusts.

• Diarrhea — reported in up to 58% of patients; often the most common side effect
• Abdominal pain or cramping — affects up to 44% of patients
• Nausea — reported in up to 30% of patients
• Flatulence (gas) — common, especially early in treatment
• Constipation — some patients experience the opposite of diarrhea
• Steatorrhea (fatty, oily stools) — caused by Octreotide's effect on fat absorption
• Headache
• Dizziness
• Fatigue
• Injection site pain or reactions — redness, swelling, or discomfort at the injection site (for injectable forms)

These side effects are usually mild to moderate and tend to decrease over the first few weeks. If any of them persist or become severe, talk to your doctor about dose adjustments or management strategies.

Serious Side Effects: When to Call Your Doctor

While less common, some Octreotide side effects require immediate medical attention. Contact your doctor right away — or go to the emergency room — if you experience any of the following:

Gallstones and Gallbladder Problems

This is one of the most significant long-term risks. Up to 27% of patients on long-term Octreotide develop gallstones or biliary sludge. Symptoms include:

• Sudden, intense pain in the upper right abdomen
• Pain between your shoulder blades
• Nausea and vomiting after meals
• Fever or chills (which may indicate cholecystitis or cholangitis)

Your doctor will likely order periodic gallbladder ultrasounds to monitor for gallstone formation.

Pancreatitis

Inflammation of the pancreas can occur. Seek immediate medical attention if you experience severe upper abdominal pain that radiates to your back, especially with nausea, vomiting, or fever.

Heart Rhythm Changes

Octreotide can cause bradycardia (slow heart rate) and cardiac conduction abnormalities. Symptoms to watch for include:

• Feeling like your heart is beating slowly or irregularly
• Dizziness or fainting
• Unusual fatigue or weakness

Blood Sugar Changes

Octreotide affects how your body handles blood sugar, potentially causing severe hyperglycemia (high blood sugar) or hypoglycemia (low blood sugar). This is especially important if you have diabetes. Symptoms of high blood sugar include excessive thirst, frequent urination, and blurred vision. Low blood sugar symptoms include shakiness, sweating, confusion, and rapid heartbeat.

Hypothyroidism

Long-term use can suppress TSH (thyroid-stimulating hormone), leading to hypothyroidism. Symptoms include unexplained weight gain, fatigue, cold sensitivity, and dry skin. Your doctor should monitor thyroid function periodically.

Other Serious Side Effects

• Intestinal obstruction
• Hepatitis (liver inflammation)
• Thrombocytopenia (low platelet count)
• Anaphylaxis (severe allergic reaction) — rare but requires emergency treatment

Side Effects in Specific Populations

Pregnant and Breastfeeding Women

Octreotide is classified as Pregnancy Category B — animal studies have not shown fetal harm, but there are no adequate studies in pregnant women. It should only be used during pregnancy if clearly needed. Octreotide is excreted in breast milk at concentrations similar to blood levels, so caution is advised if breastfeeding.

Older Adults

Elderly patients may be more sensitive to Octreotide's side effects due to age-related changes in liver, kidney, and heart function. Dose adjustments may be necessary, and monitoring should be more frequent.

Children

Safety and efficacy in pediatric patients under 6 years old are not fully established. Serious adverse events — including necrotizing enterocolitis and hypoxia — have been reported in neonates and infants receiving Octreotide.

Patients with Diabetes

Because Octreotide affects insulin and glucagon secretion, patients with diabetes need close blood sugar monitoring. Your doctor may need to adjust your diabetes medications — including Insulin, Metformin, or sulfonylureas — when starting or changing your Octreotide dose.

How to Manage Octreotide Side Effects

Most common side effects can be managed with practical strategies:

For Gastrointestinal Symptoms

• Start with a low dose — your doctor may gradually increase your dose to give your body time to adjust
• Eat smaller, more frequent meals to reduce nausea and abdominal discomfort
• Avoid high-fat meals, which can worsen steatorrhea and diarrhea
• Stay hydrated — diarrhea can lead to dehydration, so drink plenty of fluids
• For Mycapssa oral capsules, take them on an empty stomach (1 hour before or 2 hours after meals)

For Injection Site Reactions

• Rotate injection sites between the thigh, abdomen, and upper arm
• Let refrigerated medication come to room temperature before injecting
• Apply a cold compress after injection if you experience pain or swelling

For Gallstone Prevention

• Keep up with regular ultrasound monitoring as recommended by your doctor
• Maintain a healthy diet — some evidence suggests high-fiber, low-fat diets may help
• Report any abdominal pain promptly

For Blood Sugar Management

• Monitor blood glucose regularly, especially when starting treatment or changing doses
• Keep a log of readings to share with your doctor
• Have fast-acting glucose available in case of hypoglycemia

General Tips

• Don't skip doses — inconsistent dosing can make side effects worse
• Keep all follow-up appointments for lab work and monitoring
• Tell your doctor about all medications you take, including supplements, to avoid drug interactions

Final Thoughts

Octreotide is an effective medication for several serious conditions, and understanding its side effects helps you manage your treatment with confidence. Most common side effects are temporary and improve with time. The key is staying in close contact with your doctor, attending regular monitoring appointments, and speaking up when something doesn't feel right.

If you're having trouble finding Octreotide due to supply shortages, Medfinder can help you locate it in stock near you. And if cost is a concern, check out our guide on saving money on Octreotide.