Which of the following is NOT a common side effect of medications for neurological conditions?

Muscle turgidity is not commonly associated as a side effect of medications used to treat neurological conditions. In the context of pharmacology, particularly for drugs targeting neurological disorders, the side effects often include alterations in mood, behavior, and sedation levels.

Drowsiness is frequently reported due to the sedative effects of many neurological medications, including antiepileptics and antipsychotics. Headaches can occur as the body adjusts to new medications or due to the underlying neurological condition itself. Irritability is also noted as these treatments may impact mood or emotional stability.

Muscle turgidity, which refers to stiffness or tightness in muscles, is less directly related to the pharmacological effects of these classes of drugs, and instead may occur in specific conditions like Parkinson's disease, but that is a manifestation of the disease itself rather than a typical medication side effect. This makes muscle turgidity an outlier when considering common side effects of neurological medications.