QUESTION: My friends are all buzzing about Dysport, but they don't seem to know anything about it except that it is something like Botox. How does it work? Is it safe?

ANSWER: Dysport, like Botox, is a wrinkle relaxer. When injected, it paralyzes the facial muscles that cause frown lines and crow's feet. It was approved for cosmetic use by the U.S. Food and Drug Administration in April.

A treatment usually involves three to five small, almost-painless injections that relax the muscles over several days. Dysport lasts up to eight months, compared to the four to six months Botox is effective.

It also is slightly stronger and faster-acting than Botox, says Roger Bassin, an oculoplastic surgeon and medical director of the Bassin Center for Facial Plastic Surgery in Orlando. And it spreads better, offering a more natural appearance.

Dysport treatments are slightly less expensive than Botox. For example, Dysport costs $190-$240 to treat frown lines while Botox is $200-$250.

Side effects may include temporary soreness or bruising around the injection site or slight headaches. Rarer reactions include ptosis (drooping eyelid), which may last a few days or up to four weeks, and an allergic reaction that can cause flu-like symptoms.

Dysport is marketed by Medicis Aesthetics. It should be administered only by a medical professional. For more information, especially if you are considering treatments, consult your doctor.