Thanks for bringing this to our attention, Lainie! There is no caffeine in our Tylenol Arthritis Pain Caplets so your experience is very unusual. So we can learn more about what happened and gather some details about this product, please give us a call at 1-877-895-3665. We're here to assist you Monday-Friday 9AM-7PM ET.
The EPUB files format is accepted by Kindle. However, to ensure proper conversion, it is recommended that you check the conversion with the ePubCheck Tool before uploading the file. Kindle uses the unzipped version of the ePub files and converts them for publishing. Plain Text (.txt)
If DRM prevents you from converting ebooks to new formats, as they appear, their chances of survival are probably fairly slim. The safest long-term options are plain ASCII text and RTF (Rich Text Format), neither of which provides a very satisfying format for reading ebooks. The next best is ePub, but I can understand why people buy Kindles.