Dysport vs. Botox: what's the difference?

There are three main toxins we use for cosmetic purposes. Botox, Dysport and Xeomin. In addition there is myobloc that is commonly used for medical issues where neuromodulators are useful. They all have the same active ingredient which is botulinum toxin created from a bacteria. 
Essentially these products give similar results in trained hands. We can make them work properly by diluting them to similar effectiveness and by placing them in certain locations. 
Pricing likely varies by practice. For instance we use a lot of both products so the companies are able to give us a deal due to large quantity purchase. We then are able to pass those savings onto the patient.
Find an injector you trust, be clear with your goals.
Hope this helps,
Best of luck,
DrC

Both Botox Cosmetic brand from Allergan and the Dysport brand from Ipsen are both serotype A botulinum toxin. Clincially they are quite similar and doctors have had to become familiar with the usage of Dysport as there is no exact conversion formula from the number of Botox units to Dysport units. The onset of action might be just one day quicker than Botox but duration of effectiveness of similar. I discovered the above findings for myself with patients who had Botox injected on one side of their face and Dysport on the other and had me examine them every day for the first week, then once per week for a month then once per month.Dypsort has been on the market distributed by Medicis since it's approval by the FDA in 2009 but has a small market share compared to Botox Cosmetic. The cost may vary depending on the practice offering it and the city in which one lives.Although it is a good product, I have not found any advantages of Dysport over Botox clinically for my patients.The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs. 

Dysport and Botox are both "wrinkle relaxers" or neuromodulators.  They are two subtle variations of the same basic chemical compound (abobotulinum toxin type A vs. onabotulinum toxin type A).I have used both on many patients, and I find that the differences between the two are minimal.  There are some minor pros and cons to each one in theory, but in the day to day reality of helping patients soften the lines that bother them I see very little difference overall.Dysport sometimes can offer a slightly softer end result which is one reason that I enjoy using it.They key is to find the right dose and the right injection pattern that works best for each individual patient.  A great result can be achieved with either product.  Rarely I will find that some patients tend to respond better to one versus the other as far as the length of time that the effect lasts.  Most people get the same duration of around 3 months or slightly longer whether they are using Botox or are using Dysport.