Final answer:
True, glyceryl trinitrate (GTN) use is frequently associated with headaches as a side effect, due to dilation of blood vessels.
Step-by-step explanation:
True, a side effect of GTN, which stands for glyceryl trinitrate, is indeed a headache. GTN is commonly used to treat conditions such as angina or congestive heart failure by dilating blood vessels, to improve blood flow. When blood vessels in the brain dilate, it can lead to headaches. This is one of the most common side effects patients experience when using GTN. While this can be uncomfortable, it's generally a signal that the medication is working as expected. If headaches persist or become too severe, it is important for patients to consult with their healthcare provider.