Index/Organizations/Merck Manual of Diagnosis and Therapy

Merck Manual of Diagnosis and Therapy

Medical textbook

Fact-Checks

8 results
Dec 5, 2025
Most Viewed

Can men have orgasm without ejaculation and what causes it?

Yes — men can and do have orgasms without ejaculating; that phenomenon is commonly called a “dry orgasm” or anejaculation and can be temporary or permanent depending on cause (examples: recent ejacula...

Nov 18, 2025
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How do humans typically get infected with parasites?

Humans acquire parasitic infections through several well-documented routes: ingestion (contaminated food or water), penetration of skin, and via animal or insect vectors such as mosquitoes and ticks —...

Dec 5, 2025
Most Viewed

Can long-term bacopa use affect liver function, kidney function, or blood clotting?

Clinical and preclinical sources show no clear signal that Bacopa monnieri causes liver enzyme elevations or clinically apparent liver injury; LiverTox states “Bacopa has not been linked to liver enzy...

Nov 16, 2025

What treatments are effective for anal fissures caused by sex?

Anal fissures from anal sex are treated first with conservative measures—fiber, stool softeners, sitz baths, topical anesthetic or muscle‑relaxing creams—and most acute fissures heal in days to weeks ...

Nov 17, 2025

Are there any treatments for men who experience ejaculation without orgasm?

Ejaculation without orgasm (also called ejaculatory anhedonia, dry orgasm, or orgasmic anejaculation depending on features) is recognized in clinical literature and patient resources; treatments depen...

Dec 14, 2025

Are there known interactions between bacopa and stimulatory nootropics like modafinil or caffeine?

There is limited direct clinical evidence on interactions between Bacopa monnieri and stimulatory nootropics such as modafinil and caffeine; most sources report possible pharmacokinetic interactions v...

Dec 9, 2025

What lifestyle factors and sexual practices contribute to nonbacterial prostatitis?

Nonbacterial prostatitis (chronic pelvic pain syndrome, CP/CPPS) is the most common prostatitis type and its cause is largely unknown; many authorities treat it as noninfectious and point to pelvic-fl...

Nov 5, 2025

What causes anal fissures after anal intercourse and how soon do they appear?

Anal fissures after anal intercourse are caused by mechanical tearing of the anal lining from overstretching or direct trauma, often compounded by sphincter spasm and poor local blood flow; symptoms c...