Can caffeine pills make you irritable?

I've been taking caffeine pills and i follow the dosage, less than 2 pills, like 1.5 pills. And I notice I feel irritable, more than usual and i wonder if its because of the caffeine pills? When I drank the coffee it was not like this. I take the pill because its faster than drinking coffee and i dont have to... show more I've been taking caffeine pills and i follow the dosage, less than 2 pills, like 1.5 pills. And I notice I feel irritable, more than usual and i wonder if its because of the caffeine pills? When I drank the coffee it was not like this. I take the pill because its faster than drinking coffee and i dont have to go to the bath room as much.
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