Medicine for respiratory problems is got from
Ephedra
Ephedrine is obtained from Ephedra. It is a stimulant and generates heat. It stimulates the brain and thus increases the vitals. It dilates the bronchioles as well and thus is helpful in respiratory problems. It has many side effects and due to its stimulant activity, it is a commonly abused drug. So, the correct answer is 'Ephedra'.