This study describes the most common penicillin-regime for hospitalized patients with community-acquired pneumonia in Denmark. One hundred and seventy-one consultant physicians received an anonymous questionnaire, 85% were returned and 75% were evaluated. The most common regime is a treatment duration of six to ten days with 3-6 million IU of penicillin daily given in three doses. The most common route of administration is intravenously until the patient's body temperature drops. Then the same dose is given orally. Variations in strategy were revealed and call for further investigations to establish and maintain restrictive antibiotic regimes.