If local anesthetic is administered without considering the patient's medical history, what may occur?

Administering local anesthetic without considering the patient's medical history can lead to an increased risk of allergic reaction. This is particularly important because certain individuals may have sensitivities or allergies to specific components of the anesthetic solution, such as epinephrine or preservatives. A thorough medical history helps identify these risks and allows the practitioner to choose a more suitable alternative or take preventive measures.

While inadequate pain control, prolonged anesthetic effect, and increased effectiveness can also be potential complications arising from improper administration, they are not specifically tied to the omission of a patient's medical history in the same way that allergic reactions are. Understanding a patient’s allergies or sensitivities is imperative to ensuring patient safety and efficacy of care.