I was using Axiron...
A couple of thoughts. The reason Axiron makers (Lilly) doubled the formula to 2% may be because the skin in the Axilla area is thin and the surface area is minimal. My point is there is less surface area for absorption, and the skin is thinner which means less skin for the formula to be absorbed ino. I liked Axiron, but I think using Androgel in that area will be less sufficient than using it elsewhere.
I've done a lot of research and it seems absorption rates are better with Androgel. This may have as much to do with where you apply it as it does with the formula itself. You see higher numbers reached with Androgel than with Axiron, and I always assumed this is why.
I realize Androgel is up to 1.62% now, but I still think it will not be as effetive when applied to the Axilla. Everythign I read points to this. As far as timing, it takes a couple of hours to absorb into the skin. Once this happens it is supposed to release over 24 hours. Meaning after a couple hours it's safe to wash the area used as all that is going to be absorbed, has been absorbed. I have also read info that suggests using such a small area for an extended period of time can diminish the capability of the skin to absorb and actually use the formula.
I never had any side effects from the Axiron. I'm assumign you don't get them with Androgel even under the armpit? Are you certain it was the Axiron?