Hello and thank you for your question.
Before the treatment for blood in the semen can be started, it is important to find the cause first. Because infection is not the only reason for blood in the semen, it is not recommended to take antibiotics until infection is confirmed. Also if, indeed, there is an infection present, it is important to know where it is coming from because duration of treatment and antiobiotics vary based on that information. But most importantly, there are no antibiotics which are sold over-the-counter, they are only available by a prescription through a doctor.
Besides infection, there are many other causes which can cause blood in semen. They include a tumor in the bladder, prostate, or testes; stones in the prostate; obstruction in the ejaculation ducts, along with other causes.
Because of all these different possibilities, it is recommended that you see your doctor as we can only suggest what you should but without examining you, it is impossible to pinpoint an exact cause.
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