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Yes, brief fasts may be allowed during phentermine treatment, but avoid extended fasting and follow your prescriber’s plan.

Yes, fasting while on metformin is usually safe with planning—monitor glucose, take doses with meals, and stop if low-sugar symptoms appear.

Yes, fasting while taking Zepbound can be done, but adjust your plan to manage nausea, hydration, and low blood sugar risk.

Yes—religious fasting is valid with non-menstrual spotting; true menstruation breaks the fast and must be made up later.

Yes, you can combine fasting with a ketogenic diet, but start modestly and skip it if you have medical risks or concerning symptoms.

Yes. You can fast while taking levothyroxine if you time each dose on an empty stomach and keep the same schedule.

No, fasting during post-period spotting isn’t wise until you know why the spotting is happening.

Yes, fasting on isotretinoin is possible; dose with meals and drink outside fasting hours to keep absorption and comfort on track.

Yes—short, gentle fasting during menstruation is fine for many people, but stop if bleeding is heavy or you feel weak or dizzy.

Yes, fasting is fine with light, old-blood discharge; stop for heavy bleeding, pain, pregnancy, or infection signs.