I took antibiotics for a vaginitis and since finishing them a white patch has appeared on my tongue.

It is possible to develop a yeast infection, also known as thrush, after taking antibiotics. Symptoms may include a white coating on the tongue. If the infection is mild, it may go away on its own within a couple of weeks. However, if you experience pain, loss of taste, fever, or other severe symptoms, it is recommended to consult with a healthcare professional for proper diagnosis and treatment. You can also visit a pharmacy for guidance on the best course of action.