Spasmodic Dysphonia is characterised by action induced involuntary spasms of the laryngeal muscles. The treatment of Spasmodic Dysphonia has evolved pari passu with the suspected underlying aetiological cause. Initially it was considered psychogenic in origin but little benefit was gained by psychotherapy, speech therapy and drugs. The condition is now thought to have an organic neurological basis, the precise site of which is still unclear but likely to be in the extra-pyramidal system. In this study conducted at Ferens Institute Voice Clinic, The Middlesex Hospitals the evaluataion patients with Spasmodic Dysphonia, the basis of using Botulinum toxin and the technique of intralaryngeal injections has been discussed. In this study the experience of over 200 intralaryngeal injections in 52 patients has been analysed and shown to be effective in treating adductor and abductor spasmodic dysphonia.