Which condition is described as a distressing feeling of internal restlessness?

Akathisia is a condition characterized by a compelling inner restlessness and an uncontrollable need to be in constant motion. Individuals experiencing akathisia often describe a distressing sensation that makes it difficult to remain still, leading to behaviors such as pacing or shifting positions frequently. This condition is frequently associated with the use of certain medications, especially antipsychotics, which can trigger such restlessness as a side effect.

In contrast, medication-induced Parkinsonism involves symptoms similar to Parkinson's disease, such as tremors and rigidity, often caused by certain medications. Dystonia refers to sustained muscle contractions or abnormal postures, while Neuroleptic Malignant Syndrome is a life-threatening reaction characterized by fever, muscle rigidity, and altered mental status, which is distinct from the restlessness of akathisia. Thus, the description of a distressing feeling of internal restlessness aligns perfectly with the characteristics of akathisia.