What is the immediate action to take if a patient shows signs of an allergic reaction?

The most appropriate immediate action when a patient exhibits signs of an allergic reaction is to stop the medication immediately and notify the healthcare provider. This is crucial because allergic reactions can potentially escalate rapidly and can lead to severe complications such as anaphylaxis. By discontinuing the offending medication right away, you reduce the risk of the reaction worsening.

Simultaneously, informing the healthcare provider allows for a review of the patient's condition and consideration of alternative treatment options. This coordinated response ensures that the patient receives timely intervention and care.

In contrast, increasing the patient's dosage would exacerbate the reaction and could lead to serious health risks. Changing the medication schedule may not effectively address the immediate concern of an allergic reaction, as the triggering medication would still be present in the patient’s system. Reassuring the patient without taking any action can cause a delay in necessary medical treatment, which can be life-threatening depending on the severity of the reaction.