7 Side Effects of BCC Targeted Therapies and How to Manage Them


1. Muscle Spasms

One of the most common side effects, muscle spasms, can happen anywhere in your body, but they most often affect the lower legs and feet.

Doctors believe that this happens because hedgehog inhibitors trigger a flow of calcium into muscle cells, leading to uncontrolled muscle contractions. These spasms can usually be managed with supportive care, including medications to relieve the symptoms.

Consider the following strategies:

  • Drink plenty of water (stay hydrated).
  • Get gentle physical activity, like walking.
  • Stretch or massage the cramping muscle.
  • Apply heat to tight muscles by using a heating pad or taking a warm bath.
  • Use a cold compress on sore muscles.
  • Try sports drinks to replace electrolytes.
  • Splint affected areas while sleeping.
  • Change your sleeping or sitting position.

If self-care doesn’t bring relief, ask your doctor whether a prescription pain medication or muscle relaxer might.

“Pain medicine when appropriate may help,” says Hardin. “If cramps are severe or do not go away, the healthcare team may order blood tests to check for muscle injury or electrolyte problems.”

She notes that patients taking sonidegib will require additional monitoring for muscle-related side effects. “In some cases, blood tests may show increased creatine kinase levels, which can be a sign of muscle injury,” says Hardin. “Severe muscle injury may also affect kidney function, making prompt evaluation important when muscle symptoms occur.”

2. Fatigue

About a third of people using targeted treatments for advanced BCC report feeling tired or fatigued.

This can be a result of the drugs themselves or other side effects and disease symptoms. For example, your sleep may be disrupted because of muscle spasms, you may not be eating well due to poor appetite, you may be less active (which can make you feel tired), or you may feel mentally worn out.

Try these tips for more energy:

  • Address any underlying factors that are contributing to your fatigue.
  • Try to be active every day: Talk to your doctor about an exercise program.
  • Do important tasks when you have the most energy.
  • Try mind-body activities such as yoga, massage, or tai chi.
  • Consider counseling if you’re feeling depressed or mentally fatigued.

3. Hair Loss (Alopecia)

Chemotherapy is known for causing hair loss, but many people are not aware that targeted therapies may have the same side effect. Besides fueling the growth of cancer cells, the hedgehog pathway is also important for normal tissue maintenance, including the cycle of hair growth. Blocking the pathway disrupts this cycle, leading to hair shedding.

Your hair quality and texture can also be impacted.

“Side effects include hair loss, which can be permanent,” says Hilary Gomolin, MD, a medical oncologist and hematologist at the Eugene M. and Christine E. Lynn Cancer Institute at Boca Raton Regional Hospital in Florida. “This differs from chemotherapy-related hair loss, where patients can generally anticipate hair regrowth following treatment.”

  • Choose a mild shampoo.
  • Not wash your hair every day.
  • Limit or avoid using a blow dryer or other heat appliances.
  • Limit or avoid chemical hair treatments like straightening or coloring.
  • Protect your scalp from the sun with a hat, scarf, or sunscreen.
  • Ask your doctor about medications for hair growth, including minoxidil and oral dihydrotestosterone inhibitors.

4. Taste Disturbances (Dysgeusia and Ageusia)

The hedgehog signaling pathway is involved in the development of cells in your taste buds, and blocking the pathway disrupts this function. You may experience a complete loss of taste (ageusia), or some kind of distortion in how foods and drinks taste to you (dysgeusia).

This side effect is quite common and may affect up to half of people taking these medications.

“Patients with taste changes may find it helpful to try different flavors and food textures, eat smaller meals more often, and use nutritional supplements if needed,” says Hardin.

Other strategies include:

  • Try cold or room-temperature foods.
  • Boost the flavor of foods by adding lemon, spices, seasonings, or marinades.
  • Brush your teeth and tongue before meals.
  • Try using a baking soda–salt wash or antibacterial mouthwash.
  • Add flavoring to your water.
  • Use plastic or wood utensils.
  • Try zinc gluconate lozenges.
Some data shows that delta‑9‑tetrahydrocannabinol, or THC, a component of the cannabis plant, can improve food taste, appetite, and the amount of calories consumed in individuals with disturbed taste.

You can discuss the use of cannabis with your doctor.

5. Nausea

Many people experience nausea and other gastrointestinal side effects when they begin taking hedgehog inhibitors for advanced BCC. “Symptoms such as nausea, diarrhea, and vomiting can make it harder for patients to stay hydrated and maintain good nutrition,” says Hardin. “These side effects are usually managed with supportive care, including medications to relieve symptoms, dietary changes, staying well hydrated, and checking for other health issues that may be contributing to the problem.”

There are many medications (antiemetics) that can help with nausea. Ask your healthcare team whether you should take something prior to your BCC medication to try to head off the nausea.

In addition to medicine, there are other steps you can take.

  • Ask your doctor if you should take vismodegib with food; sonidegib should be taken on an empty stomach.
  • Sip liquids slowly throughout the day. You may find that cold, clear liquids, such as apple juice, broth, or ginger ale, are the easiest on your stomach.
  • Try to eat several small meals or snacks throughout the day.
  • Stick with bland foods that are easy to digest, such as plain crackers, clear broth, toast, and plain yogurt.
  • Sour foods, such as sour candy, pickles, lemons, or lime, might be helpful in controlling nausea.
  • If smells bother you, try to eat your meals when they are cool or at room temperature.
  • Try to eat small amounts of mild, high-calorie foods that are easy to eat or drink, such as pudding, ice cream, sherbets, yogurt, and milkshakes.
  • Limit or avoid fried, spicy, or greasy foods.
  • Try relaxation techniques, such as meditation, deep breathing, or listening to soothing music.

6. Decreased Appetite

A loss or decrease in appetite is common in some cancers and their treatments. Hedgehog inhibitors can affect gastrointestinal function, including your sense of taste, which can reduce your desire to eat.

But even if you don’t feel hungry, it’s important to get sufficient calories and nutrients.

Medications are available that can help increase your appetite. There are also nonmedicinal strategies you can try to help your appetite.

  • Keep food and drinks handy, so they’re available whenever you feel hungry.
  • Eat foods that are high in calories and protein, such as dried fruits, nuts, yogurt, eggs, and cheese.
  • Eat foods that are cool or at room temperature if food smells bother you.
  • Instead of trying to eat three large meals a day, switch to smaller meals or snacks throughout the day.
  • Take an anti-nausea medication about 30 minutes before you plan to eat.

7. Weight Loss

Losing weight unintentionally is fairly common in cancer care, and it may be related to the disease or the side effects of treatment. With targeted treatments for BCC, the combination of changes in taste, loss of appetite, and nausea may mean that you’re eating much less than usual.

“Regular monitoring of weight and nutritional status is especially important for older adults and others who may be at higher risk for malnutrition,” says Hardin.

Consider the following strategies:

  • Try to eat a high-calorie, well-balanced diet.
  • Boost your calorie intake with nutritional supplement beverages.
  • Eat smaller meals more frequently to increase your food intake.
  • Get help planning meals from a nutritionist or dietitian.

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