@Iwant_to_make_love_to_my_quack, just want to say I am fascinated by your username...lol.
Seriously though, can you see a pattern in the responses you are getting to your question?
Benzodiazepines are a chemical that you absolutely do not want to take lightly.
There are dozens, probably hundreds of members of this forum who have been to hell and back as a result of these drugs.
I would consider myself a benzodiazefiend myself and I can tell you they are to be treated with extreme caution.
Yes they can be very useful for anxiety/panic attack and for short term insomnia, and are certainly helpful for coming down from certain other substances, however they have very sharp teeth and if you aren't very careful they will rip you to shreds.
As previous posters have already mentioned, if 0.5mg didn't do what you needed them to do then try 1mg, don't just jump straight to 3mg, and 6mg would generally render someone with no tolerance to alprazolam completely zombified.
For myself, I find the sedating effect is the first thing to go when my tolerance is building, I still continue to get anxiety relief.
Anyway I feel I am rambling and just repeating what others have already said, please be very careful and if you need to increase your dose then do it in small steps and make every effort to not end up in a place where you are dependant on them to get through the day.
A bit of googling will find heaps of scary information regarding these meds, there are people who have done damage that may never be fully rectified.
Withdrawl from benzos can actually be fatal and even if it isn't it is 100% one of the worst withdrawls of all substances.
And sorry, I continue to ramble...I don't usually start my day with coffee and coke..
I can't actually remember what your original question was...something about tolerance...if you use any substance regularly and continue to incrase the dose you will build tolerance and said substance will have less affect that is the definition of tolerance.
I always get confused about the correct use of the words effect and affect...so anyway please be careful.