A Hauppauge-based manufacturer of vitamins, over-the-counter medicine and generic prescription drugs is expanding for the fourth time since 2014.

A&Z Pharmaceutical Inc. wants to convert 26,000 square feet of unused warehouse space at 350 Wireless Blvd. to production space as part of a $6.7 million plan to increase its portfolio of generic prescription drugs.

A&Z has won about five new contracts for drugs used in treating depression, anxiety disorder, arthritis pain, diabetes and other ailments — and expects to bid on 10 to 20 more contracts next year, said Erwin Li, the company’s vice president.

“We've already launched some products, but with the additional space we expect to be able to increase our manufacturing capability for prescription drugs quite a bit,” he said during Thursday

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