NULL is a Metered-Dose Inhaler (MDI) containing a potent combination of two Long-Acting Beta-Agonists (LABAs): Formoterol and Salmeterol. This dual bronchodilator therapy is prescribed for the long-term, daily maintenance of respiratory diseases such as Chronic Obstructive Pulmonary Disease (COPD) and certain cases of Asthma. The two LABAs work synergistically to provide rapid-onset and sustained, 12-hour relaxation of the airway muscles, significantly reducing symptoms like wheezing, shortness of breath, and chest tightness by maximising airflow.
Written by: Syed Jommy Abbas, B. Pharma
Reviewed by: Dr. Devika Rani, MBBS
Last updated on: 28-01-2026
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NULL is a Metered-Dose Inhaler (MDI) containing a potent combination of two Long-Acting Beta-Agonists (LABAs): Formoterol and Salmeterol. This dual bronchodilator therapy is prescribed for the long-term, daily maintenance of respiratory diseases such as Chronic Obstructive Pulmonary Disease (COPD) and certain cases of Asthma. The two LABAs work synergistically to provide rapid-onset and sustained, 12-hour relaxation of the airway muscles, significantly reducing symptoms like wheezing, shortness of breath, and chest tightness by maximising airflow.
NULL is a prescription inhaler used to help people with long-term breathing problems like COPD (Chronic Obstructive Pulmonary Disease) and Asthma. These conditions often cause the muscles around the airways to tighten, making it hard to breathe, a problem known as bronchoconstriction.
This inhaler contains two long-acting medicines that help open up the airways:
NULL is specifically indicated for the long-term, twice-daily maintenance treatment of:
Used to reduce exacerbations and improve lung function in patients with chronic bronchitis and emphysema who require continuous bronchodilation.
Prescribed for adult patients who require a long-acting bronchodilator, always used in conjunction with an appropriate anti-inflammatory medication (like a separate inhaled corticosteroid), as using LABAs alone in Asthma is generally not recommended.
Note: This inhaler is for maintenance only and must not be used for the immediate relief of acute asthma attacks or sudden breathlessness. A separate, short-acting rescue inhaler is required for emergencies.
Consistent, twice-daily use of this dual LABA therapy provides several key benefits:
The combination of two different LABAs provides a more extensive and reliable bronchodilation effect than a single agent.
The long duration of action of both Formoterol and Salmeterol means the airways stay open for a full 12 hours between doses, covering both day and night.
Effectively reduces chronic symptoms such as wheezing, coughing, chest tightness, and the feeling of breathlessness.
By maximising lung capacity, the medication helps patients perform daily activities and exercise with greater comfort.
Delivered in a single, portable Metered-Dose Inhaler, simplifying the daily treatment regimen.
Side effects are typically related to the stimulation caused by beta-agonists. If any side effect persists or worsen, consult your doctor.
NULL is a Metered-Dose Inhaler (MDI) and requires proper technique to ensure the medicine reaches your lungs effectively.
NULL operates exclusively through bronchodilation, which is the widening of the airways. Both active ingredients belong to the Long-Acting Beta-Agonist (LABA) class, targeting specific receptors in the lungs:
Store the inhaler canister at room temperature, away from moisture, direct sunlight, and heat. Do not puncture or incinerate the canister, even when empty, as it is pressurised. Keep all medications safely out of the reach of children.
There are no known clinically significant food interactions with this inhaler. However, excessive consumption of caffeinated products (coffee, strong tea, energy drinks) should be avoided, as caffeine is a stimulant that can amplify the side effects of LABAs like nervousness, insomnia, and palpitations.
Inform your physician about all medications you are taking, particularly:
Use this medication with extreme caution and under strict medical supervision if you have a history of:
Overdose symptoms are directly related to the excessive stimulation from the beta-agonists. Signs may include severe chest pain, extreme tachycardia (very rapid heart rate), dangerous arrhythmias, profound tremor, severe headache, and nausea. If an overdose is suspected, seek emergency medical care immediately.
As detailed above, if a dose is missed, take it when remembered unless it is nearly time for the next dose. Never take more than the prescribed number of inhalations to compensate for a missed dose.
If you miss a dose of NULL, take it as soon as you remember. If it is already close to the time for your next scheduled dose (e.g., within 6 hours), skip the missed dose entirely and resume your regular twice-daily schedule. Do not double the dose to compensate.
Therapeutic Class
Anti-Asthmatic and COPD Preparations / Dual Bronchodilator
Action Class
Long-Acting Bronchodilator (Sustained Airway Relaxation)
Chemical Class
Long-Acting Beta-Agonists (LABAs)
Habit Forming
No
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