Comparative Head Lice Therapy With Dimet 5® vs. Hedrin® Once

Inclusion Criteria: * Acute head lice infestation * Age ≥ 6 months * Adequate informed consent for study participation: * Age-appropriate informed consent and verbal informed consent from the patient (if capable of both). * Written informed consent from the legal guardian(s) (written and verbal). Exclusion Criteria: * Adults (≥ 18 years of age) * Known hypersensitivity to any component of the test or comparator product. * Scalp lice therapy in the previous 2 weeks (with an appropriate drug or medical device). * Severe disease of the scalp or injuries/open wounds on the hairy head * Secondary infection in the area of the hairy head * Treatment with cotrimoxazole or trimethoprim in the last 4 weeks or new treatment to be initiated now * Other relevant reasons, e.g. diseases or dysfunctions, which, in the opinion of the investigator, militate against the inclusion of the patient in the study (including risk factors for severe COVID-19 disease in the case of SARS-CoV-2 infection) * Simultaneous participation of another household member in the trial. * Previous participation in this trial * Participation in another trial within the last 30 days * Inability of the legal guardian(s) to understand the study content and instructions. * Limited legal capacity of the legal guardian(s) * Apparent unreliability or unwillingness to cooperate on the part of the legal guardian(s) * Known alcohol, medication or drug dependency of the legal guardian(s) * Dependence of the patient or guardian on the sponsor or investigator.