I've been diagnosed with uti before, so I'm always immediately aware when I'm infected. But sometimes the symptoms are very severe. The sensation to pee and the burning are so strong that I end up spending a lot of time in the loo. In such cases I eat 1 Niftas 100mg tablet immediately. But if the symptoms don't wear off even after 2-3 hours of taking it, is it safe to take one more dose of the same tablet? How many can I take in one day?