In phosphatic deposits connected with waste of nervous tissue, and in alkalinity of urine with nerve-depression, phosphoric acid is very useful, and it has relieved the symptoms of phosphatic calculus and urethro-vesical catarrh, when nitric and hydrochloric acids had failed. Benefit has also been derived from it in oxaluria.

In Rachitis, the milky phosphatic condition of urine is cleared by the acid, though Dr. H. Wood considers that the phosphates act better.