Bacillus that causes Botulism, an often fatal form of food poisoning. Also called Bacillus Botulinus.Encyclopedia Entry for Botulinum :Botulinum toxin injection - larynx. BTX is injected into the muscles around the vocal cords. This weakens the muscles and improves voice quality. It is not a cure for laryngeal dystonia, but can help ease the symptoms. In most cases, you will have the BTX injections in your health care provider's office. There are 2 common ways to inject BTX into the larynx: Through the neck: You may have local anesthesia to numb the area. You may lie down on your back or remain sitting up. This will depend on your comfort and your provider's preference. Your provider may use an EMG (electromyography) machine. An EMG machine records the movement of your vocal cord muscles through tiny electrodes placed on your skin. This helps your provider guide the needle to the correct area. Another method involves using a flexible laryngoscope inserted through the nose to help guide the needle. Through the mouth: You may have general anesthesia so you are asleep during this procedure. You may also have numbing medicine sprayed into your nose, throat, and larynx. Your provider will use a long, curved needle to inject directly into the vocal cord muscles. You provider may place a small camera (endoscope) into your mouth to guide the needle.You would have this procedure if you have been diagnosed with laryngeal dystonia. BTX injections are the most common treatment for this condition. BTX injections are used to treat other problems in the voice box (larynx). They are also used to treat many other conditions in different parts of the body.You may not be able to talk for about an hour after the injections. BTX can cause some side effects. In most cases, these side effects only last a few days. Some of the side effects include: A breathy sound to your voice Hoarseness Weak cough Trouble swallowing Pain where the BTX was injected Flu-like symptoms.In most cases, BTX injections should improve your voice quality for about 3 to 4 months. To maintain your voice, you may need injections every few months. Your provider may ask you to keep a diary of your symptoms to see how well and how long the injection is working. This will help you and your provider find the right dose for you and to decide how often you need treatment.Injection laryngoplasty; Botox - larynx: spasmodic dysphonia-BTX; Essential voice tremor (EVT)-btx; Glottic insufficiency; Percutaneous electromyography - guided botulinum toxin treatment; Percutaneous indirect laryngoscopy - guided botulinum toxin treatment; Adductor dysphonia-BTX; OnabotulinumtoxinA-larynx; AbobotulinumtoxinA.Blitzer A, Sadoughi B, Guardiani E. Neurologic disorders of the larynx.