Thanks for the query to ATD for an opinion,
If you have been on antibiotics and uristat for UTI and pain relief alone, then these drugs should not be a reason for a loss of vaginal sexual arousal sensations. However, phenazopyridine or uristat if taken at higher doses of more than 80mg a day can often cause such sensory side-effects.As you have been taking this medication along with antibiotics for symptoms related to a urinary tract infection, or possibly self-treating yourself , do not take it for more than 2 days. It is suggested that you should avoid using uristat and watch for sensations to return in next 48 hrs. If they do not then you need to be evaluated by a neuro physician for a local nerve dysfunction.
Wishing you good health,
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