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One question concerning the CP: if you get a prescription from a vet/doctor, I would imagine that the pharma would likely fill it with pills instead of the powder. How can you be sure to get the powder form?
Insist upon it. They may try to push the pills on you because that's all they have it stock. However, any pharmacy can order powder CP from a place like this: http://www.pccarx.com/
If all else fails, you can still use the tablets. Besides having to crush them up, the downside is you get less "chloroquine base" out of them so less bang for your buck. The following was taken from Bob Goemans online book, THE LIVING AQUARIUM MANUAL:
In most cases, 250 mg tablets have an equivalence of 150 mg chloroquine base, and 500 mg tablets have an equivalence of 300 mg chloroquine base. Although the purity mentioned above is generally accurate, it would be best to verify the chloroquine base contained in the tablets of your choice in order to be able to properly calculate the exact dosage. Keep in mind if you decide to use the tablets, there are some inactive ingredients, which you may have to deal with, e.g., Camauba Wax, Colloidal Silicon Dioxide, Dibasic Calcium Phosphate, Hydroxypropyl Methylcellulose, Magnesium Stearate, Microcrystalline Cellulose, Polyethylene Glycol, Polysorbate 80, Pregelatinized Starch, Sodium Starch Glycolate, Stearic Acid, and Titanium Dioxide. And as mentioned earlier in this chapter there are occasions where some medicines are not in their pure form (100% pure), i.e., mixed with a substance called a 'carrier,' which should be noted on its label. If so its potency is reduced, and if not sure about the exact amount of medication needed, suggest contacting a more experienced aquarist for the way to resolve this situation.