4 doctors weighed in:
How much caffeine does it take to produce an irregular heart-beat or other caffeine related illnesses?
4 doctors weighed in

Dr. Johnnie Strickland Jr
Family Medicine
2 doctors agree
In brief: Variable
This is highly variable depending on the individual and problems them may have as well as medications they may be taking.
Check out caffeineweb.Com for excellent discussions on this.

In brief: Variable
This is highly variable depending on the individual and problems them may have as well as medications they may be taking.
Check out caffeineweb.Com for excellent discussions on this.
Dr. Johnnie Strickland Jr
Dr. Johnnie Strickland Jr
Thank
Dr. James Rotchford
Addiction Medicine
In brief: It depends
Drinking coffee can actually help some relax, particularly if they are in some sort of withdrawal from caffeine which is a real issue for some.
So individual variables are such that hard and fast rules about dosing could be hard to establish. Generally if someone is drinking less than 2 cups in a day the side effects are minor. If sensitive, even a half cup late in the day may be problematic.

In brief: It depends
Drinking coffee can actually help some relax, particularly if they are in some sort of withdrawal from caffeine which is a real issue for some.
So individual variables are such that hard and fast rules about dosing could be hard to establish. Generally if someone is drinking less than 2 cups in a day the side effects are minor. If sensitive, even a half cup late in the day may be problematic.
Dr. James Rotchford
Dr. James Rotchford
Thank
Get help from a real doctor now
Dr. Keegan Duchicela
Board Certified, Family Medicine
10 years in practice
16M people helped
Continue
107,000 doctors available
Read more answers from doctors