Brief Answer:
Yes mostly it should be taken life long.

Detailed Answer:
Hi,

Thanks for your query.

Yes mostly you have to continue taking the tablet for life long as it is an hormone therapy which helps reduce male hormones. It is found that prostate cancer may be stimulated by male hormones.

Some doctors also stop the tablet when the hormone level is less and again restart it when the hormone begins to rise. I would suggest you meet your treating doctor for further information about the usage of tablet.

I hope this answered your query. Let me know if you have any other queries.

With regards,

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