Estradiol vs Estring

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Hi Everyone 

I hope everyone if doing the best possible.

I have a dosage query.  After being on Anastrozole a few months in 2023 I became waterworks incontinent.  Between GP and consultant I changed to Tamoxifen to allow oestrogen pessaries.  After several weeks this worked brilliantly.  However, after a few months, due to symptoms slightly returning, the twice weekly needed increasing to 3 to 4 times weekly to keep the pipes thickened. This was fine but I'm forgetful (ADHD).  I swapped to Estring. 

Now I'm 6 weeks into using Estring.  Incontinence symptoms have returned.  

I assumed Estring 7.5 micrograms/24 hours vaginal delivery is 52.5mg weekly. Hence more than 5 x estradiol 10mg pessaries.  However on the box also states 2mg! See pic. 

Have I misunderstood this?  

Thank you.