noun
pharmaceutical company
A company that develops, manufactures, or sells pharmaceutical products.
彼は大手の薬品会社に勤めている。
He works for a major pharmaceutical company.
製薬会社 specifically refers to a company that manufactures pharmaceuticals, while 薬品会社 is a broader term that can include distribution and sales.
Compound of 薬品 (yakuhin, 'medicine, drug') + 会社 (gaisha, 'company').