You should be ok as it is a low strength but you have to remember that whilst on antibiotics your immune system is much more susceptible to bacterial infections.
You will have to take extra care of the tattoo and make sure that you are in general good health.
If you have any bouts of dizziness, nausea, shortness of breath or bleeding from the nose, do not get tattooed.
The only difference between a person with tattoos, and a person without is this. The person with tattoos does not care if you do not have any.