Canceling Shapshift Form

Playing as a Druid in classic, is there a way to cancel shapeshift mode on spell cast, say a self heal?

Thank you for the reply.
Is there a way to integrate this with Healbot.. IE I'm shifted and when I click on a heal it fires cancelform first?

Create the macro as shown by Strife. You'll need one for each of the heals you're using. Then on the Spells tab in Healbot, call the macro instead of the heal directly. So, for example, if left click is Regrowth put myRegrowthMacroName instead.

This doesn't work for me, I have set up the macro. Selected the Macro and all it does is cast it on myself everytime.

Ok I found a fix that works it will break me out of form cast Rejuv and then I am free to shift back in or carry on healing.

I tried many variations including @hbplayer and @player and this is the only one which worked properly.

#showtooltip
/target [@mouseover, exists]
/cast Rejuvenation
/targetlasttarget

The targetlasttarget I'm not sure why it's in there but it doesn't do any harm. I found this on the Warcraft Forums after spending some time Googling, I'm not sure if it will help anyone else but for me this is great.