F-Zol IV belongs to a group of medicines called antifungals. It works by stopping the growth of fungus and is used to treat infections of the mouth, throat, vagina and other parts of the body including fingernails and toenails. It kills fungi by destroying the fungal cell membrane. F-Zol IV is an injectable drug and given as a drip by a healthcare professional. Do not self administered the injection. Your doctor or nurse will teach you the correct way of injecting it. To get the most benefit, take this medicine at evenly spaced times and continue using it until your prescription is finished, even if your symptoms disappear after a few days. If you stop treatment too early, the infection may return and if you miss doses you can increase your risk of infections that are resistant to further treatment. The most common side effects of this medicine include stomach pain, headache and feeling sick (nausea). You could ask your doctor about ways of preventing or reducing these effects. You should stop taking it straight away if you have any signs of an allergic reaction or of congestive heart failure. Signs of this include rash, swelling of the lips, throat or face, swallowing or breathing problems, feeling dizzy or faint and nausea. Do not take it if you are pregnant or could become pregnant unless your doctor has told you to. Talk to your doctor before taking it if you have ever had heart failure, a weak immune system (including HIV/AIDS), kidney problems or liver problems such as yellow skin (jaundice). This medicine may not be suitable for you. If your course of treatment is for more than a month, your doctor may want to check your liver by testing your blood. The medicine may make you dizzy or have blurred vision so do not drive or operate machines until it is safe.