[GamemodeRP123]

CreateDynamic3DTextLabel("/healme \nYou cant use this command anymore!",COLOR_DBLUE,);// /healme

Sendplayermessage(playerid,You already have enough health)
Disableplayercommand(/healme,playerid \Player already use it);

Try this
__________________________________________________ ____________
If i help yyou just press +rep button