No, there is no medical nor proof of solvency. Please go to the link:
migracion.gob.do
Here are the all of the requirements to extend the stay for up to 120 days in total:
REQUIREMENTS
- Copy of the passport page where the biometric data is.
- Stamp of the date of the last entry to the country.
- Return boarding pass.
PROCEDURE TO FOLLOW
1- The user makes the extension request through the web portal and uploads the required documents.
2- The responsible staff receives the application online and debug the documents supplied by the user.
3- The request for extension of stay by the corresponding staff is approved.
4- An email is sent to the user informing about the status of their request.
5- The user makes the payment of stay online or at the airport.