What is a common adverse effect of ranolazine (Ranexa)?

Ranolazine (Ranexa) is an antianginal medication used to treat chronic angina by improving blood flow to the heart and reducing the heart's workload. One of the notable common adverse effects associated with its use is dizziness. This side effect can occur due to the medication's effects on cardiac and vascular dynamics. Dizziness often arises from hypotensive effects or changes in blood flow, and patients may experience it, especially upon initiating therapy or adjusting dosages.

While patients on ranolazine can indeed experience other side effects such as headache or constipation, dizziness is particularly relevant based on its pharmacological profile. Headache, although common with many medications, is not as specifically linked to ranolazine as dizziness. Constipation is another side effect, but it is less frequently reported compared to dizziness. Hence, dizziness stands out as a more characteristic response to ranolazine, making it the answer in this context.