WEBUnited States North Carolina: GSK 410 Blackwell St. Durham, NC 27701 United States. How can we help you? Visit our GSK Help Centre for patients, caregivers and HCPs in US. Alternatively, call us on Tel: +1 888 825 5249. Monday, Tuesday, Thursday, Friday: 8:30 AM - 5:30 PM ET. Wednesday: 8:30 AM - 4:00 PM ET. Closed holidays. Privacy contact: