"Citra 100mg" is a brand name used for different medications containing various active ingredients, most commonly either tramadol (a painkiller) or itraconazole (an antifungal). The specific medication and its use depend on the exact product and the prescribing physician's instructions. 
Uses and Active Ingredients
The "Citra 100mg" designation refers to different products in the market. The two primary types found in search results are:
Citra Tramadol 100mg:
Active Ingredient: Tramadol hydrochloride, an opioid analgesic.
Uses: It is used to treat moderate to moderately severe pain, including chronic pain from conditions like osteoarthritis or neuropathic pain, or pain after surgery. It works in the central nervous system to change how the body feels and responds to pain.
Citrazol/Gracitra 100mg:
Active Ingredient: Itraconazole, an antifungal agent.
Uses: It is used to treat a variety of fungal and yeast infections in different parts of the body, such as the skin, mouth, and nails. It works by killing and stopping the growth of fungi.