What is the recommended injection technique for botulinum toxin in the treatment of horizontal forehead lines?

The recommended injection technique for botulinum toxin in treating horizontal forehead lines involves injecting within the horizontal forehead line safety zone using a 30-degree angle. Injections should be placed intramuscularly along the frontalis muscle, starting medially and moving laterally, with doses of 2.5 units of Botox spaced approximately 1 cm apart. Care should be taken to avoid injecting too inferiorly to prevent eyebrow ptosis.

The injection technique for botulinum toxin in the treatment of horizontal forehead lines focuses on targeting the frontalis muscle, which is responsible for these lines. The injections are performed within the defined horizontal forehead line safety zone, which is bounded by vertical lines at the lateral limbi and extends from 2 cm above the supraorbital ridge to the hairline. The procedure involves positioning the patient at a 60-degree reclined angle and identifying the frontalis muscle by having the patient contract it. Using a 30-gauge needle, the injector places the needle at a 30-degree angle into the muscle ridge and administers 2.5 units of Botox intramuscularly, ensuring even distribution across the forehead for symmetry. The injections should be spaced approximately 1 cm apart, and care must be taken to avoid injecting too deeply or inferiorly to prevent complications such as eyebrow ptosis.