Is in that anything, after taken, would lower one's IQ? (please state whether for good or temporary)?

booze lowers IQ’s temporarily .
Illegal drugs will really mess you up, sometimes permanently.
If you are worried roughly speaking that - just don't help yourself to it, whatever it is!
lots things..
Lead. for example. MERCURY. permanent.
Alcohol. Temporary. unless you do profoundly of it.
be sober and clean b4 u lift it.
Alcohol and marijuana are two good examples-both makeshift
of course.
viagra..probably beyond repair
There are several factors that can influence the try-out results scores of an IQ testing.
For instance, Mozart's music has proven encouraging as far as aiding higher score but its results are only conditional, lasting in the order of 15 seconds.
On the other foot, there are also physiological change that can have the in front of effect. Anything that alters the chemicals in the brain and throws it out of sync, can effect permanent and irreversible defile. From slight to moderate changes that crop up from taking drugs that kill neuro-transmitters to becoming brain insensible or worse. These changes later again, can vary from personage to person but are more probable to be permanent than not.
GREAT Stress- Temporary unless repeated afterwards kills ya.
yes-marriage vows-permanent!