ANSWER:

This is not authentic. 

The Prophet (ﷺ) said when he broke his fast:

ذَهَبَ الظَّمَأُ وَابْتَلَّتِ الْعُرُوقُ وَثَبَتَ الأَجْرُ إِنْ شَاءَ اللَّهُ
Zahabaz zama’u wabtallati urooq wa thabatal ajru in sha Allah
Thirst has gone, the arteries are moist, and the reward is sure, if Allah wills.
 [Sunan Abi Dawud 2357]

In my country India, the following dua is recited before opening fast Allahumma laka sumtu wa bika amantu wa `alayka tawakkaltu wa `ala rizqika aftartu. Is it authentic? If not what to say before opening fast?

Fasting, Supplications | April 24, 2020 11:50 am
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Sheikh there is Hadith in sahi muslim whoever say subhan allahi wa bihamdihi 100 times in a day his sins will be erased even if they are like foam of sea .sheikh my question is all major and minor sins are erased
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I work in a hospital. And I have the issue of repeated episodes of headache, sometimes very severe which impairs my work. My question is, during fasting, can I use transdermal patches of painkiller medicine which are placed on skin and the drug gets absorbed directly through the skin into blood?