More serious potential side effects include irregular heartbeat, seizures, heart attack, stroke, or death.

Symptoms of overdose may include drowsiness or fast heartbeat.

Common side effects include jitteriness, headache, and fast heartbeat.

Overdose symptoms may include dry mouth, blurred vision, and fast heartbeat.

When combined with an energy drink, its effects may include cardiovascular risks, shortness of breath, and rapid heartbeat.

Very rare side effects of clonidine include depression and irregular heartbeat.

These other symptoms may include: Rapid or irregular heartbeat.

Symptoms of overdose may include: very fast heartbeat, loss of consciousness.

Symptoms of a poisoned horse include severe diarrhea and abnormal heartbeat.

Adverse health effects include irregular heartbeat, increased blood pressure and a variety of psychological problems.