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

Starting a new cancer medication is stressful enough without surprise side effects. Sonidegib (Odomzo) is an effective treatment for locally advanced basal cell carcinoma, but it comes with a side effect profile that patients need to understand before and during treatment. Knowing what to expect—and when to call your doctor—can help you stay on therapy longer and manage your care more confidently.

The Boxed Warning: Embryo-Fetal Toxicity

Sonidegib carries a boxed warning—the most serious warning the FDA issues—for embryo-fetal toxicity. This means:

Sonidegib can cause fetal death or severe irreversible birth defects if taken during pregnancy.

Females of reproductive potential must use effective contraception during treatment and for at least 20 months after the last dose.

Males must use condoms (even after vasectomy) during treatment and for at least 8 months after the last dose to prevent exposing their partner.

Do not donate blood for at least 20 months after your last dose, and males should not donate semen for 8 months.

If you become pregnant while taking Sonidegib, contact your doctor immediately and report the pregnancy to Sun Pharma at 1-800-406-7984.

Common Side Effects (Occurring in 10% or More of Patients)

In the BOLT clinical trial, the most common side effects in patients receiving Sonidegib 200 mg daily included:

Muscle spasms and pain — the most frequently reported side effect; can range from mild cramping to severe muscle pain

Alopecia (hair loss) — common; can affect hair on the scalp, body, and other areas

Dysgeusia (taste changes) — food may taste different; metallic, bland, or altered flavors are commonly reported

Fatigue and weakness (asthenia) — low energy levels are very common with Sonidegib

Nausea and vomiting — taking Sonidegib on an empty stomach as directed can sometimes worsen nausea; discuss anti-nausea medications with your doctor

Decreased appetite and weight loss — many patients experience reduced appetite over the course of treatment

Diarrhea — gastrointestinal effects are common and manageable in most cases

Abdominal pain and headache — reported by a significant portion of patients in clinical trials

Pruritus (itching) — skin itching is reported in some patients

Amenorrhea (in women) — absence of menstrual periods; it is not yet known whether this is permanent in all cases

Serious Side Effects: When to Call Your Doctor Immediately

Rhabdomyolysis (severe muscle breakdown): This is the most dangerous non-reproductive side effect of Sonidegib. Symptoms include: severe or unexplained muscle pain or weakness, dark or cola-colored urine, decreased urine output, and swelling. Call your doctor immediately if you experience these symptoms—rhabdomyolysis can cause kidney failure.

Elevated creatine kinase (CK): Your doctor will monitor your CK levels with blood tests. Significant CK elevation may require dose interruption or permanent discontinuation, even before severe symptoms develop.

Amenorrhea with fertility concerns: If you are a woman of reproductive age who wishes to have children in the future, discuss this with your doctor before starting Sonidegib. The long-term effects on fertility are not fully known.

How Long Do Side Effects Last?

Side effects from Sonidegib tend to be persistent rather than transient. In the BOLT trial, many patients who discontinued were doing so due to grade 1 or 2 side effects that were not severe but were chronic and affected quality of life. Side effects generally resolve after stopping the medication, but given the drug's long half-life, this can take weeks.

Alopecia and taste changes are typically gradual, and many patients report improvement after dose reduction or drug holidays if approved by their doctor.

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Tips for Managing Common Side Effects

Muscle cramps: Stay well hydrated; gentle stretching; discuss magnesium supplementation with your doctor

Nausea: Eat small, frequent meals; avoid strong smells; ask your doctor about prescription anti-nausea medications if needed

Taste changes: Experiment with cold foods, which may taste less affected; use plastic utensils if metallic taste is prominent; season food more heavily

Fatigue: Prioritize sleep; ask your care team about low-intensity exercise, which is often helpful for cancer-related fatigue

Hair loss: Consider wigs, scarves, or hats; be gentle with hair and scalp; most patients see hair return after discontinuation

Finding the Right Care Support

Managing Sonidegib side effects is easier when you have the right support. Make sure you're getting your medication reliably by using medfinder to locate pharmacies that can fill your prescription. Also, avoid drugs that can worsen side effects — read our guide on Sonidegib drug interactions to understand what to avoid.