Among the more serious potential side effects of clonidine are heart problems such as an irregular heartbeat or heart palpitations, or an unusually slow heartbeat (bradycardia). If you experience this ...

As with other drugs, Onyda XR (clonidine) can cause side effects, such as sleepiness and fatigue. More common side effects of Onyda XR may vary depending on whether it is being used by itself or in ...

This side effect typically impacts fewer than one in 100 people ...