Immunotherapy given as pills or drops under the tongue is a safe and effective way to treat hayfever-like allergies caused by pollen and dust mites, according to a Cochrane systematic review.
The reviewers looked at 60 trials on pollen and dust mites, and one on cat allergens.
Sublingual immunotherapy significantly reduced symptoms of allergic rhinitis and requirements for medication compared with placebos.
The authors said the results confirmed the treatment was effective and had very few serious adverse effects.
They said: “This is an attractive approach for treating allergies in children. It is a more convenient alternative compared to injection immunotherapy.”