Azadirachta indica is a large, evergreen tree. Its principle constituents are nimbin, nimbinin and nimbidin. All parts of the plant yield b-sitosterol.

It is used for external applications in skin diseases. Neem extracts possess antidiabetic, antibacterial and antiviral properties. The tree stem, root and bark possess astringent, tonic and antiperiodic properties. The bark is beneficial in fever and useful in cutaneous diseases.