Caustic Pencil 40% (or silver nitrate stick) is a device for applying topical medication. Therefore, It contains silver nitrate and potassium nitrate, used to cauterize skin chemically.

• It is applied topically in aqueous solution and used as a haemostatic, for pain relief in certain conditions and for the removal of small quantities of unwanted tissue.
• its uses include nongenital warts and verrucas, granulation tissue, wound healing, stoma maintenance, umbilical stumps, cautery, anterior epistaxis, vasomotor rhinitis, post-bioptic cervical nicks, skin tags and pain relief for aphthous stomatitis.