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metformin side effect

i am new to this drug and dr prescribe for my DM. however, itchy rash started ever since i started on metformin. a patch of itchy rash on my chest area near my left breast. it is itchier when i perspire. i can only shower and applied the snake powder on it to relieve. pls advise me dr.thank u
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Dr. Adnaan S
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Hi @lynn . Thank you for your question!

I would say that you should definitely go down to see your GP. It is important to establish a timeline in cases where we are suspecting a possible drug allergy. In general, rashes relating to allergies can occur anytime between 24-72 hours after ingestion of the offending agent. In rare cases, a medication of which you previously had no allergy against can cause an allergy only a few months after. 

In this situation i would recommend review for 2 reasons
(a) If related to metformin it would require your to stop and possibly change to another drug temporarily (depending on the severity of your diabetes) 
(b) Itchy rashes around the breast or any skin folds can often be mistaken for allergies and can turn out to be bacterial/fungal infections instead or a form of eczema. Given that you are diabetic, you are at higher risk for these easily treatable skin infections. 

At times it may be difficult to discern if the rash is related to a drug or infection and most physicians would consider stopping the drug and treating at the same time. 

If Any alarm symptoms for severe allergy are present such as difficulty breathing/throat swelling/extreme eye swelling or hand/leg swelling/palpitations/chest pain, please go directly to the AnE for management as these could be suggestion of anaphylaxis (severe allergy) 

hope this helps!
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@lynn
thanks alot Dr Adnaan!
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