Nalcrom is used to treat mastocytosis which is caused by the presence of too many mast cells in the body. It works by acting on the mast cells in the body to prevent them from releasing substances that cause symptoms of the disease, such as abdominal pain, nausea, vomiting, diarrhea, headache, flushing or itching of skin, or hives.

Before using Nalcrom tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding. Also let your doctor know if you have liver or kidney disease, and if you are taking any prescription or nonprescription medicine or dietary supplements. Inform your doctor if you are allergic to any of the ingredients that are present in Nalcrom.


For Adults and children 12 years of age and older — The starting dose for this age group is 200 mg mixed in water and should be taken four times a day, thirty minutes before meals and at bedtime.

For Children 2 to 12 years of age — Starting dose is 100 mg, mixed in water, four times a day, and thirty minutes before meals and at bedtime.

For Infants and children up to 2 years of age — Dose is based on body weight and must be determined by your doctor. The dose starts with 20 mg per kilogram (kg) (9.1 mg per pound) of body weight a day.

Nalcrom Side Effects

Rare side effects – Coughing; difficulty in swallowing; hives or itching of skin; swelling of face, lips, or eyelids; wheezing or difficulty in breathing.

Less common side effects – Skin rash, abdominal pain; irritability; muscle pain; nausea; trouble in sleeping.

Common side effects – Diarrhea; headache.

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Information provided on this website is for general purposes only. It is not intended to take the place of advice from your practitioner