There are many complementary treatments for asthma but they shouldn’t replace the prescription medication a clinician recommends. Breathing techniques can help control shortness of breath and reduce the need for reliever treatment, but you should always keep your inhaler close by, just in case.
Air purifiers for asthma can help to reduce allergens as they clean the air, but they can be expensive and aren’t always effective. There’s little evidence that homeopathy or acupuncture offer any benefit.