What are common adverse drug reactions associated with guanfacine?

Guanfacine is primarily used for the treatment of attention-deficit hyperactivity disorder (ADHD) and as an antihypertensive. One of the well-documented characteristics of guanfacine is its sedative effect, which can lead to drowsiness. This makes drowsiness one of the most significant and commonly reported adverse drug reactions associated with the medication. Additionally, many patients may experience headaches and dizziness as these can also be linked to the central nervous system effects of the drug.

Insomnia might seem counterintuitive given guanfacine's sedative properties, but it can occur as a side effect when the medication is initiating treatment or when dosing adjustments are made. Anorexia is another adverse reaction that can emerge as a result of guanfacine use, impacting the patient's appetite and overall nutrition.

Recognizing these specific adverse drug reactions is critical for monitoring the patient's response to guanfacine therapy, ensuring that any potential negative effects are managed effectively. The other choices list side effects that are less commonly associated with guanfacine or pertain to different medications altogether.