You shouldn't be doing drugs and yes, they do slow down your heart rate.
when your asleep your heart beat slows down
spicy foods increase our heart rate but nothing will slow it down.
Typically, heart rate increases with inhalation. It is not normal for the heart to slow down with inhalation.
alcohol makes you very clumsy and slow and is a depressant, unlike ecstacy, it will slow down your heart rate.
marijuana can cause anxiety wich increases your heart rate , lorazepam will slow down your heart rate and calm you
your heartbeat will slow
You typically have a slow heart rate when you are at rest. When you have the flu, you really don't get out of bed during this time, so it is normal to have a slower heart rate.
The nervous system
There are a great number of chemicals that can speed up or slow down the heart rate, as well as chemicals that can change the rhythm of your heart.
No foods will significantly reduce your heart rate. Caffeine may speed it up, but nothing will slow it down.
I think you may mean a heart rate... To slow it down you should cool down after your work out. Try walking for a bit after you run and slow down your breathing with deeper, longer breaths.