[bleedingspiderlegs]

works just fine for me.
Make sure you have the option "Auto un/re-equip hands for potion" checked and this macro should work for you(assuming youre using greater cures)
Before you record right click>if poisoned. right click the if poisoned on top and click begin recording from here(or whatever it says and just double click the potion.
if you want this macro to auto-work when fighting(assuming youre using weapons and not spells..since the macro will shut off if you use another macro) click loop and itll auto-cure you when you get poisoned.