Type of yoga therapy that is effective in the treatment of obsessive compulsive disorder, and is a combination of Pranayama with chanting of mantra, is commonly known as :

Kundalini yoga

Kundalini Yoga taught in the USA has been found to be effective in treatment of mental disorders. The Institute for Nonlinear Science, University of California, San Diego, USA has found that Kundalini Yoga is effective in the treatment of obsessivecompulsive disorder. Kundalini Yoga combines pranayama or breathing techniques with chanting of mantras.