What brand have you tried and what did you notice by taking them?
Regarding posaconazole: Does that cause cell membrane leakage like other RX antifungals? It looks like a ergosterol inhibitor. Wikipedia states it does come with more serious side effects:
Two studies suggest posaconazole may be superior to other triazoles, such as fluconazole or itraconazole, in the prevention of invasive fungal infections, although it may cause more serious side effects.