Harsingar is also known by many names such as night jasmine, paarijat. Its botanical name is Nyctanthes arbor-tristis.  There are many medicinal use of this tree, some of them are.

For sciatica :

take 3-4 leaves and grind them and boil with water and drain and drink twice in day.

For swelling and pain: Boil leaves in water to make decoction and drink.

For arthritis:

Take leaves, bark, flower about 5 gm and make decoction with 200 gm of water.  Decoction     is said to be formed when water reduces to ¼ of initial quantity.

For dry cough:

Grind leaves in mortar and pestle to extract juice and take it with honey.

For intestinal parasites:   Grind leaves in mortar and pestle to extract 2 tbs of juice and take it with misri and water.

For ring worm:

Apply paste of leaves on affected area.

For fever:

Take 3 gm bark and 2 gm leaves with 2-3 leaves of tulsi and boil in water and drink 2 times a day.