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How does Botox (botulinum toxin) work?

Medically reviewed by Carmen Pope, BPharm. Last updated on April 4, 2024.

Official answer

by Drugs.com

There are eight different types of botulinum toxin produced by C. botulinum; A, B, C1, C2, D, E, F, and G. All work by blocking the release of acetylcholine, one of the most significant neurotransmitters in our body. Acetylcholine activates muscles, so blocking it causes muscle relaxation and paralysis. Injections enable the botulinum toxin to be targeted directly into specific muscles. There it has a direct effect on acetylcholine in the nerve synapses, preventing signals that would normally cause the muscle to contract.

Type A is the most potent and longest lasting, followed by types B and F. Currently, preparations containing Type A and B are commercially available and include:

All have different potencies and are not interchangeable; care needs to be taken so that the correct dosage stated is used for that product. Each manufacturer uses assay methods specific to their company, so even though dosages may be quoted in similar sounding units, potency varies several-fold between the different products. Approved indications also vary.

Effects are usually seen within 24-72 hours and peak around ten days. Effects last about two to four months or until new nerve terminals sprout and form new synaptic contacts.

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Masseter Botox is a procedure where Botox is injected directly into your masseter muscle – this is one of the muscles located on the side of your face that helps you chew. The masseter Botox procedure has become popular recently because it can slim a square face and reshape the jaw line. The cosmetic benefits of this procedure were discovered by accident – the original reason Botox was injected into the masseter muscle was to relieve teeth grinding (also called bruxism) and jaw pain or tension. Continue reading

How many units of Botox do I need and what will it cost?

Botox (onabotulinumtoxinA) is measured in units, and the number of units you need depends on the treatment area, muscle strength, and your goals. Most providers charge $10–$25 per unit in the U.S.

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Both Daxxify (daxibotulinumtoxinA-lanm) and Botox (onabotulinumtoxinA) are effective neuromodulators derived from botulinum toxin type A, designed to smooth dynamic wrinkles. Botox offers a long-established track record with results typically lasting 3-4 months. Daxxify represents a newer innovation, distinguished primarily by its longer duration of effect, often lasting 6 months or more, thanks to its unique peptide stabilizer.

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