As even strong MDMA pills are rarely over 120mg, yes this is too much for a single dose IMO. Personally I find 30-50mg just right, sometimes with a second dose 1-2 hours on if it's desirable. If you are not a regular "double dropper" I would suggest 1/4 of that at the most and then see how you go. You can always have more and if you don't need more you have some for next time.
If it is a pure 200mg, it won't be much in quantity. Certainly not a large 00 cap full. Test it first. It should be white/off white/brown in colour, it should fizzle and quickly turn purple/blue -> black with Marquis and Mandelin, and a very small bit should turn simons reagent instantly blue.
Good luck, but please be aware PMA has been reported in SA. Powders are easy to adulterate after distributing so please start off with a small dose and if possible observe your dealer on a dose before you decide its OK to take.