Buying medicine online is really risky. I would not suggest buying from India or Asia as they have a high rate of forgery. I am thinking of buying on line as it works out to be 200-300% cheaper. I have always bought mine from a chemist never on line.
If you have never taken Modafinil and you are not a narcoleptic, tread very carefully. It does depend on your predisposition to process this unnatural substance. Some people react badly it's down to your Genetics.
I have been taking Modafinil for over 10 years for Narcolepsy. I still get slammed sometimes (not enjoyable if you take too much).
Don't expect too much the first time you take it. It is very slow acting. Don't take too much. I would recommend no more than 100 mg the first time. Do not take another pill in the same 24 hour period you could end up taking too much. If I have been off it for say 1 month and then take 200 mg, that can be too much and could end up being awake for 24 hours, which is not great if you have a regular 9-5 job.
Don't expect a buzz. The benefits for people who are not narcoleptic are in the long term effects on your brain and your body. I have basically stopped aging I started taking it when I was 35 and I am now 46 and still waiting to get wrinkles, glasses, and I have never had a single grey hair.
I compete on line at video games and rank in the top 20 which at my age is just unthinkable when you consider the competition are 15 year olds with reflexes that should be a lot faster than a 46 year old.
You should really start to notice the benefits after regular use for about 1 week.
To really get a feel for it you should take it as soon as you wake up and then exercise for a couple of hours ever day 7 days a week. You will be able to tell the difference between 100 - 200 mg. Once your body gets used to the medication (if it can) you can start taking larger doses (DO NOT THINK MORE IS BETTER. TOO MUCH IS NOT ENJOYABLE)
Good Luck.