Sandostatin Side Effects: What to Expect and When to Call Your Doctor

Sandostatin (octreotide) is a powerful synthetic hormone that works by suppressing the secretion of multiple hormones throughout your body. That broad action means it can cause side effects in several organ systems — some of which are minor and resolve over time, and others that can be serious and require medical attention.

This guide covers what to realistically expect when starting or continuing Sandostatin, organized by severity — so you know what's normal and what warrants a call to your doctor.

Common Side Effects (Usually Manageable)

The most frequently reported side effects involve the gastrointestinal system — which makes sense, because Sandostatin suppresses digestive hormones and reduces gastric acid and pancreatic secretion.

GI-Related Side Effects

• Nausea and vomiting: Common, especially when starting therapy or after an injection. Usually improves after the first few weeks. Taking Sandostatin Injection with food or reducing the injection speed may help.
• Diarrhea or loose stools: Ironically common given that Sandostatin treats diarrhea in carcinoid syndrome — it results from altered fat absorption in some patients.
• Abdominal pain or cramping: Mild-to-moderate stomach discomfort is reported by many patients, particularly early in treatment.
• Flatulence: Increased gas is a common complaint, related to altered GI motility and fat digestion.
• Steatorrhea (fatty/oily stools): Sandostatin reduces pancreatic enzyme secretion, which can impair fat digestion. Some patients develop pale, oily, or foul-smelling stools. This can lead to weight loss if severe and may require enzyme supplementation.

Injection-Site Effects (LAR Formulation)

Pain, swelling, redness, or a lump at the gluteal injection site is common with Sandostatin LAR Depot. Rotating injection sites helps minimize this. Most discomfort resolves within a few days.

Other Common Effects

Headache, dizziness, and fatigue are reported by some patients, especially early in treatment.

Serious Side Effects: Call Your Doctor

Several more serious effects require monitoring and prompt attention:

Gallstones (Cholelithiasis)

One of the most common serious side effects of long-term Sandostatin use is gallstone formation. Sandostatin inhibits gallbladder contractility and reduces bile secretion, leading to bile sludge and, over time, gallstones. Incidence increases with duration of therapy.

Your doctor should perform periodic gallbladder monitoring (typically via ultrasound). Symptoms of gallstone complications include fever, chills, nausea, vomiting, and severe upper abdominal pain spreading to the back. Some patients require cholecystectomy (gallbladder removal).

Blood Sugar Changes (Hypo- and Hyperglycemia)

Sandostatin alters the balance between insulin and glucagon — the two hormones that regulate blood sugar. This can cause blood sugar to go either too high (hyperglycemia) or too low (hypoglycemia), particularly at the start of treatment or when doses change.

Signs of high blood sugar: increased thirst, frequent urination, dry mouth, fruity breath. Signs of low blood sugar: headache, hunger, sweating, shakiness, dizziness, rapid heart rate. Blood glucose monitoring is recommended when starting or changing doses.

Cardiac Effects (Bradycardia and Arrhythmia)

Sandostatin can affect heart rhythm and rate. In acromegaly patients, bradycardia (heart rate below 50 bpm) has been reported in approximately 25% of patients receiving IV formulations. Conduction abnormalities — including complete heart block in rare cases — have been reported during IV use, particularly at higher than recommended doses.

Call your doctor if you experience an unusually slow heartbeat, palpitations, chest discomfort, or fainting.

Hypothyroidism

Sandostatin suppresses thyroid-stimulating hormone (TSH), which can lead to an underactive thyroid over time. Symptoms include extreme fatigue, dry skin, cold intolerance, weight gain, and muscle weakness. Your doctor should check thyroid function (TSH and free T4) at baseline and periodically during treatment.

Vitamin B12 Deficiency

Long-term use of Sandostatin can reduce vitamin B12 absorption. Depressed B12 levels have been reported, and monitoring is recommended. Symptoms of B12 deficiency include fatigue, numbness or tingling in hands and feet, and difficulty with balance or memory.

When to Seek Emergency Care

Get emergency care if you experience:

• Signs of an allergic reaction — hives, difficulty breathing, swelling of face, lips, tongue, or throat
• Severe upper abdominal pain spreading to your back with fever and chills (gallstone complications or pancreatitis)
• Fainting, sudden change in heart rate, or chest pain
• Severe low blood sugar symptoms — confusion, unconsciousness, seizure

For information about how Sandostatin interacts with other medications, read our guide on Sandostatin drug interactions. And if you're having trouble finding Sandostatin in stock, medfinder can help locate it near you.