Which of the following is NOT a side effect of lignocaine?

Lignocaine, also known as lidocaine, is a local anesthetic commonly used in dental procedures. Understanding the side effects of this medication is crucial for safe administration.

Angioneurotic oedema, although a serious condition, is not typically recognized as a side effect of lignocaine. This condition usually arises from an immune response or allergic reaction involving the release of histamine and is more closely associated with certain medications and allergens, rather than local anesthetics like lignocaine.

In contrast, nervousness, cardiac arrest, and dizziness are recognized potential side effects of lignocaine due to its effects on the central nervous system and cardiovascular system. Nervousness can occur as a result of CNS stimulation at higher doses, cardiac arrest can happen in cases of systemic toxicity, and dizziness may arise from local anesthetic absorption affecting blood pressure or neurological pathways. Thus, understanding that angioneurotic oedema is not a typical side effect helps clarify why it stands out from the other options.