Final answer:
When starting a daily dose of transdermal nitroglycerin, Kristin should be prepared for headaches as an adverse effect, which is common due to the drug's vasodilating properties.
Step-by-step explanation:
The question asks about the adverse effect that Kristin might experience when starting a daily dose of transdermal nitroglycerin. The correct answer is C) Headache. Nitroglycerin is well-known for causing headaches when therapy is initiated due to its vasodilating effects, which can increase blood flow to the brain and cause pain. It does not typically cause the other listed effects such as bradycardia, hypertension, or constipation when used correctly. On the contrary, nitroglycerin is used to manage angina by relaxing the blood vessels, which can lower blood pressure and heart strain.