Allergan PLC amended the terms of its pending $2.1 billion deal for double-chin treatment maker Kythera Biopharmaceuticals Inc. by agreeing to pay for it all in cash and dropping the stock component.

In a news release Wednesday, the companies expect the all-cash transaction at $75 a share can be completed more quickly than the original deal announced in June, which was comprised of 80% cash and 20% stock.

At the time, Allergan Chief Executive Brent Saunders said the maker of wrinkle-treatment Botox had opted against an all-cash deal to save "fire power for future deals" this year.

Since then, Allergan has agreed to sell its generics unit to Teva Pharmaceutical Industries Ltd. in a cash-and-stock deal valued at $40.5 billion, of which $33.75 billion is expected to be in cash.

Allergan and several other health-products companies have been on a deal-making binge in recent years with the help of low interest rates, and to cope with pricing pressures and relatively high U.S. corporate tax rates.

In April, Kythera won U.S. Food and Drug Administration approval for injections given to eliminate the fat that makes double chins. Many doctors had been looking to add the new drug, called Kybella, to their arsenal of cosmetic treatments that include wrinkle-eraser Botox.

Allergan is counting on the interest in a new cosmetic treatment to bolster its market-leading cosmetic-medicine portfolio, and help it propel Kybella to sales exceeding Kythera's goals of $500 million in the U.S.

Actavis was renamed Allergan earlier this year, after doing $100 billion in deals last year that gave it brand-name drugs, notably wrinkle fighter Botox. Actavis acquired Allergan in a deal valued at $70.5 billion, the biggest from 2014. The deal ended one of the year's more dramatic takeover battles in which Dublin-based Actavis beat out Valeant Pharmaceuticals International Inc. for Allergan.

Write to Tess Stynes at tess.stynes@wsj.com

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