Which of the following is a noted side effect of non-phenothiazines?

Non-phenothiazines, which are a class of antipsychotic medications, are indeed associated with various side effects, and photosensitivity is one that has been notably observed. Photosensitivity refers to an increased sensitivity of the skin to sunlight, which can lead to rashes or sunburn-like reactions upon exposure to UV light.

The mechanism behind photosensitivity can involve changes in the skin's cellular structure caused by drug interactions or alterations in pigmentation. While not as commonly highlighted as other side effects, it is an important consideration for patients on non-phenothiazines, particularly those who might be exposed to sunlight frequently.

Other side effects listed, such as weight gain, tardive dyskinesia, and hyperglycemia, are more commonly associated with other classes of antipsychotics, like phenothiazines or atypical antipsychotics. While they may occur with non-phenothiazines, they are less characteristic of this drug class. Therefore, the emphasis on photosensitivity as a side effect provides a more accurate reflection of the distinct risk profile associated with non-phenothiazine antipsychotics.