INTRODUCTION: We conducted a descriptive study to evaluate any changes in practice behaviour regarding the provision of hydrocortisone and lignocaine (H&L) injections among doctors and how an H&L injection is priced following a disciplinary proceeding decision. A doctor had been fined SGD 100,000 for failing to obtain informed consent before an H&L injection. METHODS: We performed a survey shortly after the disciplinary decision to ascertain: (a) the category of the respondent; (b) whether the respondent provided H&L injections and how much he charged before the decision; and (c) after the decision. All members of the Singapore Medical Association and College of Family Physicians Singapore are doctors and were invited to participate. RESULTS: 1,927 doctors responded to the survey. Prior to the decision, 804 doctors did not perform H&L injections; this increased by 20.4% to 968 after the decision. The number of doctors who gave H&L injections decreased by 164 (14.6%), from the previous 1,123. Pre-decision, doctors who determined their own price for H&L injections charged a median pricing ≤ SGD 100. Post-decision, the median charge rose to > SGD 100 to SGD 200. At higher price bands, the number of doctors who charged > SGD 1,000 increased eight-fold, from eight to 65. CONCLUSION The study demonstrated how a disciplinary decision can affect practice behaviour, and specifically how doctors may choose to not offer a service, an example of defensive medicine through avoidance behaviour. It also showed how prices for a service can rise following such a decision, which demonstrates the concept of negative general deterrence in sentencing.