Dear Scion,
NO...Absolutely NOT.....Do not take the doxycycline. While this is a broad spectrum medication, it may or may not cure the diesease that you have.
You need a diagnosis in order to treat something. You can not assume that you have the same diseases as your girlfriend. You could have that disease or a combination of diseases. Also, the dose she is receiving is specific to her, as a female, size weight, stage of the disease, etc.
Even if you had chlamydia, your strain and level of disease may require a different medicine and strength.
She needs to take her medication exactly as prescribed, EVERY PILL OR CAPUSULE, until they are gone, and then she needs to be checked to make sure the Chlamydia is killed (she is cured). If you take her medication, two things may happen,
1. She would not be cured because she would run out of medication.
2. Your strain could become resistent to treatment because you have not approached it with a strong enough dose per pill, and you need a full course of medication, most generally 10 to 14 days, and in some cases 21 days.
3. Doxycyclilne may not be the medication of choice for your strain of disease and the stages of the disease that you have.
again, please do not take her medication. Seek your own medical treatement.
You should immediately cease all sexual activity in order to avoid reinfection, until you have been examined and treated.
Even is she is cured and you are being treated, you should have no sexual activity until you are also "clean" for at least two weeks.
The reason is, that what often happens, is that a couple will end up reinfecting each other over and over, and the disease really never gets cured. Between the two of you, you could develop a super resistant strain that will not respond to treatment.
Absolutely no sex until you are both clean for at least two weeks.
YOUR PAYMENT AND BONUS IF ANY MAY BE TAX DEDUCTIBLE

Edward M. Johnson