Nigella sativa as a Herbal Alternative Medicine in Asthma
Asthma patients normally suffer with wheezing, shortness of breathing, tightness in chest, coughing etc, but the intensity of the symptom varies from person to person.
Environmental factors also alter the symptomatic intensity of symptoms, like exposure to cold and may worsen during the spring when pollen is in the air.
Why research experts prefer to use Nigella sativa in asthma treatment?
Several Animal research and cellular level investigations, as well as human studies, were conducted to check the actual efficacy of Nigella sativa against asthma.
These study results showed that Nigella sativa and its active constituents provide similar types of clinical benefits like other pharmacological agents.
Animal study and laboratory-based research reported Nigella sativa and its active constituents like thymoquinone, α-hederin and nigellone to possess anti-asthmatic effects because of their anti-histaminic, broncho-relaxing and bronchodilatory, anti-inflammatory and immunomodulatory properties.
These combined positive effects can alter pathophysiology involved in asthma affected subjects.
Randomized double-blind human study results showed that use of Nigella sativa in treating asthma not only corrects the biomarkers alterations due to bronchial inflammation, and mast cells activation but also improves the score of the Asthma Control Test (ACT) and Pulmonary function test (PFT).
A clinical trial conducted in 2015 concluded that Nigella sativa with dosing of 500 mg twice daily for 4 weeks can improve asthma. 
The bronchodilatory effect of Nigella sativa starts within 30 minutes as similar as salbutamol (most commonly prescribed medications for acute asthma). 
A human trial result showed that Nigella sativa has a potential to control exacerbation in asthma patients and thus inhalation of Nigella sativa containing formulation can be a useful therapeutic measure for managing the asthma attacks. 
An appropriate dose of Nigella sativa can also provide prophylactic effect against asthma.
Additionally, the combination of this herbal product with other conventional anti-asthma therapies including oral and/or inhaler corticosteroid, oral and/or inhaler beta-agonists, and oral theophylline can reduce the dose of these synthetic medications. 
Therefore, using Nigella sativa supplement is a cost-effective choice which can as well reduce the synthetic medication-related side effects.
Direction to use of Nigella sativa in asthma patients
It has been established from clinical trial data that 500 mg Nigella sativa supplement two times a day for 4 weeks can help to control asthma. 
Moreover, some experts suggested for a gradual dose elevation. At the start of the therapy, take a half teaspoon of Nigella sativa oil once a day for 7 days.
After a week, take half teaspoon of Nigella sativa oil twice a day for next 7 days. Likewise, the dose can be raised up to 3 teaspoons per day. The dose selection is based on the response of the patient. 
There are a variety of dosage forms of Nigella sativa supplement that are available in the market, including Nigella sativa oil, Nigella sativa oil encapsulated in the capsule formation.
However, raw Nigella sativa seeds can also be taken as a herbal remedy, but almost 2 to 3 gm of Nigella sativa seeds are required to get the desired effect. This is quite a high quantity to take as a medicine.