Obat golongan anti inflamasi non steroid (AINS) digunakan secara luas sebagai analgesik dan anti inflamasi. Obat golongan anti inflamasi non steroid sangat umum diresepkan, terutama pada pasien usia lanjut. Resiko mengalami efek yang tidak diinginkan dari penggunaan AINS umumnya terjadi pada pasien usia lanjut. Secara teori toksisitas AINS kemungkinan dapat meningkat dengan adanya pemakaian bersama sehingga menimbulkan interaksi obat. Penelitian ini bertujuan untuk mengetahui gambaran peresepan dan masalah interaksi obat AINS di Rumah Sakit Prikasih Jakarta Selatan. Penelitian ini dilakukan dengan metode survei yang bersifat deskriptif-analitis dan retrospektif. Data diambil dari 156 resep obat AINS pada pasien rawat jalan selama bulan Juni-Agustus 2006. Dari sejumlah resep tersebut ditemukan adanya 58 resep yang mengalami interaksi obat, dimana 38 resep memiliki sedikit interaksi obat, 18 resep kategori sedang dan 4 resep memiliki banyak potensi interaksi obat. Dengan menggunakan uji Kai Kuadrat diketahui hubungan yang bermakna antara jumlah obat dalam satu resep yang mengandung AINS dengan jumlah interaksi obat yang teridentifikasi.Nonsteroidal anti inflammatory drugs (NSAIDs) are widely used for their analgesic and anti-inflammatory effects. Nonsteroidal anti inflammatory drugs (NSAIDs) are very commonly prescribed, especially in the geriatric patients who have emerged as one of the most striking risk factors commonly associated with NSAIDs therapy. From a theoretical point of view the toxicity of NSAIDs may be increased by coadministration with interacting drugs. The objectives of this study were to identify prescription and the prevalence of drug interaction of NSAIDs at the hospital Prikasih in South Jakarta. The method of this study was survey method in analytical-descriptive retrospective. Data were collected from 156 outpatient recipes of NSAIDs admitted during the study period of Juni- Agustus 2006. From the recipes were identified 58 recipes have potency of drug interaction where 36 recipes have a few potency of drug interaction, 18 recipes in medium category, and 4 recipes have many potency of drug interaction. By using Chi Square test it was concluded that were a significant correlation between the number of drugs on the recipes content NSAIDs and the number of interaction were identified.