To get Chloroquine, you need to go at your CTO of competition. ( CTO del tuo ASL).
Then you need to say that you are going to travel for a long period( 6 months or so ) to Nicaragua, for example.
Be very careful about the country, cause many malaria areas are chloroquine resistant ( that means doctors will prescribe you some another anti-malaria medication). For example Nicaragua, city Puerto Cabezas, isn't chloroquine resistant.
Also, be careful of your "departure date", because chloroquine is intended to be used 2 weeks before departure.
That said, you will need to pay for additional vaccination for Yellow Fewer (15 to 30 euro).
Remember also, that chloroquine method should be used in addition with slipping pills like Zolpidem ( Stilnoct).
The quantity is ten times the dose which would make you asleep during the day light.
The quantity of Chloroquine is 50-60 pills of phosphate 250 mg.