I drank 4 glasses of alcohol , then I vomited,...

is taking mephigastryl safe after vomiting from alcohol ?
no its not , you are not allowed to take mephigastryl directly after alcohol intake 
- that because alcohol was already in your blood system even if you vomited 
what are the complications ?
you may face serious breathing diffeculties 
what to do next :
- watch your self for at least 6 hours 
- drink milk 
- rest 
- ask a friend to help and to be with you