antropine on CVS bradycardia at low dose tachycardia at higher dose Vasoconstriction???
Antropine is a medication that acts as a muscarinic receptor antagonist, commonly used to treat bradycardia (slow heart rate) by blocking the effects of the parasympathetic nervous system on the heart. At low doses, antropine can indeed cause bradycardia due to its inhibitory effect on the parasympathetic nervous system.
However, at higher doses, antropine can have paradoxical effects and actually lead to tachycardia (fast heart rate). This is because at higher doses, antropine can also block the inhibitory effects of the parasympathetic nervous system on the heart, resulting in an increase in heart rate.
Antropine may also cause vasoconstriction, although this effect is less pronounced compared to its effects on heart rate. Vasoconstriction is typically seen as a result of antropine's action on smooth muscle in blood vessels, causing them to constrict and increase blood pressure.