The patient had been on oral contraceptives until 2006; she stopped the Ortho Tri-Cyclen when her husband had his vasectomy.

This is a run-on that requires a period after 2006.
This is a run on sentence that requires a comma and a conjunction after 2006.
This is a fragment that requires a verb after patient.
This is a fragment that requires a subject.
The sentence is fine as it is.

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The patient had been on oral contraceptives until 2006; she stopped the Ortho Tri-Cyclen when her husband had his vasectomy.