Introduction: The most effective treatment for severe acne is isotretinoin. However, it carries major side effects as teratogenicity, dryness, lipid profile disturbance and constipation. Although it is commonly prescribed with and without prescription in Libya, little date are available regarding patients understanding and awareness of isotretinoin. Aims: This study was conducted to explore the awareness of acne patients about the use of isotretinoin. It aims to measure how much acne patients know about the side effects of the drug especially the teratogenic effects, how to deal with them and how the drug influence their daily activities. Plus, to identify how patients get their information about the drug and whether they consult professional or ordinary people. Methods: A verified and validated questionnaire addressed to acne patients (n = 50, Sept. - Dec., 2019) who were under and over 20 years of age in Tripoli city was used in this study. Results: Data shows that acne patients do not have enough information about the drug. They take their information from other patients and do not usually consult doctors or pharmacists. The only side effects that the patients complained from are dryness. In addition, they are not aware that this drug can cause teratogenic effect. Conclusion: A good understanding and awareness the Libyan patients about isotretinoin help in increasing compliance and minimize adverse effects.