VERY SMALL WHITE PILL WITH 16 ON ONE SIDE GG ON THE OTHER
I think you may be looking at the 16 upside down, pills are usually imprinted like coins, turn it end over end, I think your pill is GG 91, if so it's 0.5 mg Lorazepam, there is a GG 16 but it's a very old imprint (discontinued in 1993), if you believe that is what it really is then please repost your question.
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