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Background: Lack of child-friendly dosage forms and strengths often leads to manipulation of medicines at hospital units or by caregivers in the home setting. One alternative to manipulating dosage forms is the use of extemporaneous preparations. In Sweden, these are produced according to good manufacturing practice by a few extemporaneous pharmacies., Objectives: To compare frequencies of patients administered extemporaneous preparations in two separate years, 10 years apart., Methods: This registry-based study describes and compares the frequency of extemporaneous oral preparations administered to paediatric patients in 2009 and 2019 at a Swedish university hospital.The study included 117 023 oral administrations (to 4905 patients) and 128 638 oral administrations (to 4718 patients) from 2009 and 2019, respectively., Results: The frequency of inpatients administered one or more extemporaneous preparations increased from 22% in 2009 to 40% in 2019 (p<0.0001). The increase was observed in all age groups. The use of some active pharmaceutical ingredients increased (eg, captopril, clonidine, hydrocortisone, melatonin and propranolol), and some active pharmaceutical ingredients decreased between the study years (eg, midazolam and sildenafil)., Conclusions: The introduction of new authorised products has decreased the need for manipulation or extemporaneous preparations in some therapeutic groups. There remains, however, a pronounced lack of commercially available child-friendly dosage forms and suitable strengths enabling safe administration of medicines to children, indicated by the large percentage of patients receiving at least one extemporaneous preparation., Competing Interests: Competing interests: None declared., (© European Association of Hospital Pharmacists 2023. Re-use permitted under CC BY. Published by BMJ.)