Does phentermine cause rectal bleeding?

No. Can cause constipation which could lead to hemorrhoids or fissure but does not directly cause bleeding. All rectal bleeding should be evaluated.
Maybe. A recent study of phenteramine side effects showed 0.05% of those reporting side effects reported rectal bleeding. However, the differential for rectal bleeding certainly needs to be further investigated by your primary physician.

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Can Fastin (phentermine) cause blood in stool and vomiting?

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