A kit for the preparation of a Degarelix solution for administration to a patient comprises a first chamber containing lyophilised Degarelix, a second chamber containing water for injection, a means for transferring the water from the first chamber to the second chamber, a means for delivery of the Degarelix to the patient and an automatic mixing apparatus. The mixing apparatus is adapted to receive the first chamber to mix the Degarelix and water for injection to produce the solution. In a specific embodient of a kit, a vortex mixer (150) is adapted for receiving a vial (120) by the addition of a vial guide sleeve (200) that allows the vial to be seated on the mixer. During mixing the syringe (130) stays attached to the vial (120) at the coupling (144) to prevent contamination of the contents of the vial. The mixer is also provided with an intensity setting dial (210) and an indication of the optimum intensity (220) for mixing the Degarelix product.
