Girlfriend Is Having Pain In Lower Part Of Her Stomach,
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This condition is common with girls during period and is called Dysmenorrhea.
Just give her one tablet of Ibuprofen 400 mg with Acetaminophen(Tylenol).
Repeat it if not relieved.
The drug of choice is Dicylomine (to relieve spasms) but it's not Over the counter.
Revert back if she does not feel fine after 2 doses.