Answer
They have different licences and administration. The depot injection provides contraception; lower-strength tablets treat specified gynaecological conditions, while higher-strength tablets are used in specialist cancer care.
Sources for this answer
- Depo-Provera 150mg/ml Injection — Current selected SmPCemc · Summary of Product Characteristics
- Provera 100 mg Tablets / Medroxyprogesterone Acetate 100 mg Tablets — Current selected SmPC