Over time, the muscles above and between the eyebrows repeatedly contract and tighten, causing wrinkles. Botox Cosmetic works beneath the skin’s surface and targets the underlying muscle activity that causes frown lines and crow’s feet to form over time. Normally when we squint, frown, or make other facial expressions, our nerves release a neurotransmitter chemical, known as acetylcholine. This neurotransmitter binds to receptors within the muscle to make it contract. Wrinkle relaxers like Botox and DYSPORT® work by binding to the acetylcholine receptors, and blocking the signal from the nerve to the muscles.
In 1895 (seventy-five years later), Émile van Ermengem, professor of bacteriology and a student of Robert Koch, correctly described Clostridium botulinum as the bacterial source of the toxin. Thirty-four attendees at a funeral were poisoned by eating partially salted ham, an extract of which was found to cause botulism-like paralysis in laboratory animals. Van Ermengem isolated and grew the bacterium, and described its toxin,[40] which was later purified by P Tessmer Snipe and Hermann Sommer.[41]
The recommended dilution is 200 Units/2 mL, 200 Units/4 mL, 100 Units/1 mL, or 100 Units/2 mL with preservative-free 0.9% Sodium Chloride Injection, USP, depending on volume and number of injection sites desired to achieve treatment objectives (see Table 1). In general, no more than 50 Units per site should be administered using a sterile needle (e.g., 25-30 gauge) of an appropriate length. Localization of the involved muscles with electromyographic guidance may be useful.
Spread of toxin effects. The effect of botulinum toxin may affect areas away from the injection site and cause serious symptoms including: loss of strength and all-over muscle weakness, double vision, blurred vision and drooping eyelids, hoarseness or change or loss of voice, trouble saying words clearly, loss of bladder control, trouble breathing, and trouble swallowing.