Kandankathiri is a thorny, prickly herb also known as Yellow Fruit Nightshade, with the botanical name Solanum virginianum or Solanum surattense. It has prickly leaves, blue flowers, and small, yellow, berry-like fruits that are covered in thorns. It is a well-known medicinal plant in traditional Indian medicine systems like Siddha and Ayurveda, commonly used for respiratory issues such as coughs and asthma. 

• Respiratory health: Traditionally used to treat coughs, colds, bronchitis, and asthma.
• Other potential uses: Research suggests it may have antioxidant, antibacterial, and anti-inflammatory properties.
• Preparation: Can be used in various forms, such as a decoction of the root, or as a powder mixed with warm water or honey.