Generic name: Cromolyn sodium.

Other brand names: Gastrocrom Capsules, Nasalcrom, Opticrom 4%.

Intal is an anti-allergenic and anti-asthmatic. It prevents the release of the chemicals in the body that cause the symptoms of allergies and asthma. 

Quick Facts About Intal


Used to treat bronchial asthma, prevent asthma attacks, and prevent and treat seasonal and chronic allergies.

Intal Dosage

Take exactly as prescribed. May take several weeks to observe full effect. Use Spinhaler turbo-inhaler for caplets; should not be swallowed. If you accidentally inhale powder from the capsules, rinse your mouth or drink water before and after using the Spinhaler. Replace Spinhaler and metered spray device every 6 months. Use power-operated nebulizer with face mask, not hand-operated nebulizers. Do not suddenly stop capsules or nasal solution without consulting your doctor.

  • Usual adult dose: capsules and inhalation solution — bronchial asthma — 20 milligrams (1 capsule or ampule) inhaled 4 times per day. Must take regularly. Use only when an attack is controlled and you can properly inhale. Acute asthma attack following exercise or exposure to cold, dry air or environmental irritants — 1 capsule or ampule inhaled no more than 1 hour prior to exposure to irritant. May repeat inhalation during extended exposure. Aerosol spray — Bronchial asthma — 2 metered sprays taken 4 times per day. Use only when an attack is controlled and you can properly inhale. Acute asthma attack prevention — 2 metered sprays before exposure to irritant. Nasal-crom Nasal Solution — Allergy prevention and treatment — 1 spray per nostril 3 to 4 times per day, up to 6 times per day as prescribed by your doctor.
  • Usual child dose: capsules and inhalation solution — same as adult dose for children 2 years and over. Aerosol spray — same as adult dose for children 5 years and over. Nasalcrom Nasal Solution — same as adult dose for children 6 years and over.
  • Missed dose: take as soon as possible; then take remaining doses at equally spaced intervals. Do not double doses.

Intal Side Effects

Overdose symptoms:

difficulty breathing, heart failure, low blood pressure, slow heartbeat. If you suspect an overdose, immediately seek medical attention.

More common side effects: cough, nasal congestion or irritation, nausea, sneezing, throat irritation, wheezing.

Less common or rare Intal side effects: angioedema (swelling of face around lips, tongue, and throat; swollen arms and legs; difficulty swallowing); bad taste in mouth; dizziness; ear problems; headache: hives; joint swelling and pain; nosebleed; painful urination or frequent urination; postnasal drip; rash; severe allergic reaction; swollen glands; swollen throat: teary eyes; tightness in throat.


Inform your doctor before combining Intal with any prescription or nonprescription medications you are currently taking.

No known food/other substance interactions. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Not known if Intal appears in breast milk.

No special precautions apply to seniors.

Follow doctor’s instructions carefully for children.

  • If sensitive to or allergic to this or similar medications or lactose, should not take.
  • If dose is reduced or stopped, asthma symptoms may reappear. Intal does not work once an acute asthma attack has begun. Obtain medical help if you experience a severe attack.
  • Doctor may reduce or discontinue medication if you have liver or kidney problems.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Intal side effects, please contact your healthcare provider.