Rapid response teams, also known as medical emergency teams (MET), are activated when a patient demonstrates signs of clinical deterioration to prevent transfer to intensive care, cardiac arrest, and death. MET activations were prospectively reviewed at two Australian hospitals to determine the proportion of activations due to medication-related harms and assess the preventability of the activation. 23% of MET activations were medication-related, and 63% of those were considered preventable. Most preventable activations were patients with hypertension, and prevention strategies should focus on these patients.