Objectives. To survey a random sample of pharmacist participants in the American Pharmacists Association's (APhA) Immunization Training Certification Program to determine: (1) their opinions and perceived benefits from the training program; (2) current involvement and nature of involvement in immunization-related activities, particularly administering; and (3) perceived barriers to implementing pharmacy-based immunization services. Methods. A questionnaire was mailed to 600 pharmacists who were randomly selected from 3,233 pharmacists who participated in APhA's training program as of August 2001. Results. Four mailings yielded a response rate of 38.8%. Pharmacists were overwhelmingly satisfied with the training they had received with 92.3% indicating that they would recommend the training to other pharmacists. A majority (56.6%) of pharmacists trained by APhA to provide immunizations were providing immunization-related services. Over half (65.4%) of the practicing pharmacists reported administering adult vaccines, but only 3.1% reported administering childhood vaccines. In states that allow pharmacists to administer vaccines, both those administering and those not administering vaccines perceived availability of time as the primary barrier. Conclusion. Pharmacists who had participated in APhA's Immunization Training Certificate program were satisfied with the training that they had received. About half of those trained are administering adult immunizations. Pharmacists who were not administering vaccines generally rated the barriers to immunization as more severe than those administering.