Depends what you mean?
you are high, from the proper amphetamine content, and dont like it....tough. To take an anti depressant (which depress you!) while on anphetamine, is silly, and not effective.
once the high has begun, after an initial 20 min at most,(of the actual cocaine) the amphetamine part kicks in, or, moreso ,the putty wizz amphetamine, its cut with. This amphetamine base can last for hours, of restlessness, and anxiety.
though colobian coke is a pure drug, and local anestetic, its usually well cut with wizz. this is an anphetamine and can last for 8 hours. Best to just sleep. if jumpy, eat well (as you can, as its an appetite suppressant) and have hot drinks, or do physical activity like walking and fresh air.
Your question sounds like you dont reallyknow cocaine, or have very adultarated coke...ie, wizz.
proper pure cocaine will last 20 mins, of buzz, with down feelings after, itself a come down, you dont need to come down off it, as such.
Whatever your mix, if craving, or coming down off wizz, nurophen is good, 2 every 30 mins is good.
Out of the readily available painkillers, nurophen is best, to alliviate symptons of coke, as it is mildly coke type based, yet with other helpful active ingredients.
NOTE: im talking to someone who does illegal, potentially lethal drugs, here, so i am condoning FAR more than the safe dose of shelf farrms!
Who in the right mind would ever wanna come down? Thats mainly the reason why I'm currently homeless, recently family-less, and unemployed. Stay up while you can, cause when you come down, you're gonna crash like a 757.