Whether you’re a customer, a job seeker, a health professional or an investor, the best way to contact our Belgian offices you can find below. Belgian offices GlaxoSmithKline Pharmaceuticals SA/NV Site Apollo Avenue Pascal, 2-4-6 1300 Wavre Tel :+ 32 10 85 85 00 GlaxoSmithKline in Grand Duchy of Luxembourg Hireknopf - Business Center