a. Anyone who is being forced to take it.
b. Any person with a serious heart condition, unless his doctor has given written approval.
c. A pregnant women, unless her doctor has given written approval.
d. Any person who is determined to be mentally incompetent or any person who has a respiratory illness or cold and/or any person who has nerve damage or paralysis.
e. Any person who has had a stroke or is an epileptic.
f. Any person who is in pain (i.e., toothache, headache or a recent injury).