Kythera Biopharmaceuticals Inc., which this week agreed to be acquired by Botox-maker Allergan Inc., on Friday priced its treatment aimed at reducing the double chin.

The treatment, known as Kybella, will cost physicians $300 per vial.

Chief Executive Keith Leonard had said in an interview with The Wall Street Journal that patients would need an average of two to three vials a session and an average of four sessions to see results. That translates to a total average cost to physicians of roughly $3,000 per patient.

Mr. Leonard suggested doctors could mark up the cost by about 100%, resulting in an average total price tag of $6,000 for patients looking to slim their chin area.

Other injections, like Botox, are less expensive but require more treatments.

Vials of Kybella, cleared by the U.S. Food & Drug Administration in April, will be sold in packs of four to physicians who have completed a training program. Training began this month with a core group of specialists, who will then serve as "faculty" for training other doctors. Kythera said it would also offer online training.

The company anticipates a broader rollout in the coming months. The Allergan tie-up is expected to close by October, the companies said Wednesday.

Data for Kybella goes back four years and 80% of patients have sustained results for that period, according to Mr. Leonard.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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