The medication is directly injected into the area of the body where benefit is intended for. E.g., in to cervical muscles in cervical dystonia and ocular muscles for blepharospasm. For selected areas of the body, and particularly when injecting muscles that are difficult or impossible to palpate, guidance using an electromyography (EMG) may be necessary. For instance, when injecting the deep muscles of the jaw, neck, or vocal cords, an EMG-guided injection may improve precision since these muscles cannot be readily palpated. An EMG measures and records muscle activity and may help the physician locate overactive muscles.