US pharmaceutical company Johnson & Johnson is under investigation in South Africa for allegedly charging "excessive" prices for a key tuberculosis drug, the country's antitrust regulator said on Friday. The South African Competition Commission said J&J's Belgian subsidiary, Janssen Pharmaceuticals, was also under investigation. The Commission, which regulates marketing practices, said it opened an investigation this week based on reports that the companies " may have engaged in exclusionary practices and excessive pricing" of bedaquiline , a tuberculosis drug sold under the brand name Sirturo. Thabiso Tema spoke to Editor-in-chief of the Bhekisisa Centre for Health Journalism, Mia Malan.