If you took an overdose of an anti-depressants and were told this probably shortened the life of your heart by 20 years what kind of problems should you expect?
If you get some psychological help, get on a good diet and exercise (according to your doctor's specifications) then you can add most of that 20 years back onto your life. If you don't turn over a new leaf health-wise very soon you could suffer a stroke (lose your speech, use of your arm and leg on one side of the body or have a massive heart attack.) Also blood clots that could go to the brain and may cause you to become a virtual vegetable (meaning you could well lay in a hospital or nursing home for years before death comes. It's your choice!
Yes, you can overdose on methamphetamine (crystal meth). Cardiovascular problems are most common, however a large overdose can cause psychiatric problems which could be permanent or last quite a long time (on the interval of years). See the attached link which gives more detailed information from the National Institute of Health (NIH).
Surprisingly few. As antidepressants are given to treat depression, medications that are particularly lethal in smaller doses present obvious problems. As such, I am not aware of an antidepressant that has a lethal dosage that isn't huge, and unobtainable. Do note however, that overdosing on anything may have unforeseen and uncomfortable effects, other than lethality.
A fatal overdose does not occur very often, but the following may occur if one attempts to overdose: Disorientation Drowsiness Memory problems A rapid heart rate (tachycardia) Death is more likely to occur when this drug is used with alcohol or with other drugs. Visit the Related Link for more information.