Mr Smith is 75 years old and has metastatic prostate cancer. You are reviewing his analgesia requirement as he is requesting Oramorph from the GP surgery earlier than normal. He is on Morphine Sulphate 30mg modified-release tablets twice daily. He is now requiring 5mg of Oramorph 8 times a day.
What dose of Morphine Sulphate modified-release tablets should he be increased to?