Atropine is a medication derived from the belladonna plant, commonly used in medicine for its ability to block the action of the neurotransmitter acetylcholine. It is often administered to increase heart rate in patients with bradycardia, to reduce saliva production during surgery, and to treat certain types of poisoning. In addition to its medical uses, atropine can also cause pupil dilation, making it useful in eye examinations. However, it may have side effects such as dry mouth, blurred vision, and increased heart rate. Careful dosage and monitoring are essential when using atropine in clinical settings.