Prescription Tincture BlendBuy your prescription tincture blend here. Select the size that you need. At 5ml three times a day: 100ml will last approximately one week, 300ml will last approximately three weeks, 500ml will last four to five weeks and 1 Litre two months. Please enter the following into the Comments Box when adding this item to your Shopping Cart: The name of your prescription blend(s)e. g. Main Mix, Support Mix. Your Herbalist's Name The quantity you require for