In patients with multimorbidity, healthcare providers follow various disease-specific guidelines. Besides the fact that simultaneous treatment of several chronic diseases can be intensive for the patient, there is also the risk of contradictory advice or interactions when all recommendations are applied simultaneously. There are a number of developments to make guidelines more applicable to the growing target group of multimorbid patients. The 'Methodology for senior-proof guidelines' describes how to pay attention to patients with multimorbidity in all phases of guideline development. In addition, integrated guideline use for multimorbidity is being developed through a new modular structure with the use of interconnections. The future doctor will have to acquire knowledge and skills in translating treatment goals of patients with multimorbidity into an integral and coordinated tailor-made plan in cooperation with other professionals. A guideline for the treatment of multimorbidity can provide support in working across domains without directly applicable evidence.