mania:
Because only few medicines were tested for diving. Majority was not. My inner voice tells me it's better not to dive when taking any medicines. My friend MD and a diver says the same. There is still al ot of things we don't know about our body and diving - why taking the risk?
If that's your personal preference, of course that's fine for you. You're right, there are still a lot of things we don't know about our bodies and diving. So the logical conclusion of your argument would be the "basic rule"- "Don't dive at all because we don't know everything about it". Why take the risk?
DAN and likely virtually all diving medicine specialists disagree with your own personal rule of "taking medications (of any kind) = no diving". Many "basic rules" that are quoted (in all walks of life) are misinterpretations of general recommendations (or even inappropriate extrapolations of specific unrelated recommendations). Other "rules" are are laid down to make it simple for the ignorant (who will likely never understand the basis for the "rule") to make it easier for them and to protect them from themselves. There may sometimes be some risk to taking some medications when diving, so the
easy thing to say is "taking medications (of any kind) = no diving" because of the risk. But in
many instances the risk of
not taking a medication while diving exceeds the risk of taking it. There are many many divers who safely take medications while diving, and benefit from the taking of the medicine. To tell those divers to not dive because they take medicine is unfair. And to leave the impression that they should stop taking necessary medication when diving is potentially dangerous.
You're right, if a diver doesn't have the intelligence and sense to check out a medication they are taking before diving, they probably should consider not diving. But ArticDiver is a bright guy. He's asking appropriate questions (and getting
some very good answers). Doxycycline is an antibiotic, and (with all of the usual caveats about side effects like the sun-sensitivity mentioned above, allergies, etc.) is generally considered safe to use when diving. Doxycycline is often specifically prescribed for divers traveling to tropical areas for malaria prophylaxis. ArcticDiver doesn't seem to me to be the type to need an arbitrary and unnecessary "basic rule" to protect him from himself.
mania:
But to make the long story short - if you can't speak you should be silent. Seems obvious but it's not.
Wouldn't a better explanation of the quote be, "If you don't really know what you're talking about, you should remain silent"? It does seem obvious, doesn't it? I suppose you're right that it's
not obvious to some people.