Thanks for your query.
Metrogyl is used in cases of amoebic dysentery and as a side effect in some cases a rash and itching can be seen.
As you have developed rash you should consult a doctor close by abd he will give you some antiallergic and the rash shall subside.
Also if the dysentery has not subsided then the doctor will give you antibiotics to treat the infection.
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