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MedlinePlus

Online information service produced by the United States National Library of Medicine

Fact-Checks

93 results
Nov 18, 2025
Most Viewed

What is the normal volume range of semen per ejaculation by age group?

Most clinical references put “normal” semen volume per ejaculation at roughly 1.5–5.0 mL, with many general‑audience outlets and some WHO‑based summaries quoting 1.25–5 mL; fertile‑cohort studies repo...

Dec 1, 2025
Most Viewed

Which types of vacuum erection devices are medically recommended and how to choose one?

Vacuum erection devices (VEDs) are FDA‑cleared, non‑invasive treatments for erectile dysfunction that use a cylinder, a pump (manual or battery/motorized), and a constriction/tension ring to maintain ...

Dec 18, 2025
Most Viewed

What age range do most boys start puberty and show physical signs like erections?

Most authoritative pediatric and endocrine sources place the beginning of male puberty in roughly the 9–14 years window, with population averages clustering around 11–12 years; the very first physical...

Nov 15, 2025

How common is it for women to feel satisfied without orgasming every time?

Research and popular-health reporting consistently show that many women find sex pleasurable and feel satisfied even when they do not orgasm every time: surveys report that roughly half to three-quart...

Nov 15, 2025

Are there any side effects or risks from using penis pumps?

Penis pumps (vacuum erection devices) are widely described as generally safe and effective for producing erections, but they carry predictable side effects (bruising, skin discoloration, temporary num...

Nov 16, 2025

Are there risks or side effects of taking ivermectin for coughs or upper respiratory infections?

Clinical sources show ivermectin is an approved antiparasitic with common mild side effects (dizziness, nausea, diarrhea, fatigue) and rarer serious reactions including neurological effects, severe sk...

Nov 3, 2025

What is the average amount of semen released during ejaculation in healthy males?

The best available medical summaries and studies show that , with population means commonly reported near 3–4 milliliters. Clinical reference ranges and laboratory cutoffs vary—some guidelines and rev...

Dec 16, 2025

When do boys typically experience their first nocturnal emissions and morning erections?

Boys typically begin having nocturnal emissions (wet dreams) any time after puberty begins; multiple health and teen-targeted sources place typical onset broadly between about 12 and 16 years with sev...

Nov 28, 2025

How long should I wait between penis pump sessions to avoid tissue damage?

Most consumer and clinic-oriented sources recommend modest, infrequent sessions to avoid bruising, numbness or tissue injury: common guidance is roughly 5–20 minutes per session, with rest days betwee...

Nov 16, 2025

What red flags indicate a medical or wellness company might be a scam?

Medical and wellness scams often share repeatable red flags: urgent pressure to buy, miraculous or too-good-to-be-true claims, requests for personal or Medicare/insurance data, weak or misused science...

Dec 15, 2025

Do vacuum erection devices cause permanent penile lengthening or girth changes?

Medical literature and major patient-facing outlets say vacuum erection devices (VEDs)/penis pumps do not produce permanent increases in penile length or girth; they provide temporary engorgement and ...

Nov 27, 2025

What features should I look for in a urologist-recommended penis pump for erectile dysfunction?

Urologists who endorse vacuum erection devices (VEDs) focus on medical-grade safety, ease of use, and effectiveness for ED and penile rehabilitation; look for FDA-approved models, clear pressure guida...

Dec 9, 2025

Are there recommended devices or FDA-approved vacuum erection devices and how to choose one?

Vacuum erection devices (VEDs) are FDA-cleared treatment options for erectile dysfunction and post‑prostatectomy rehabilitation; FDA guidance requires safety features such as quick‑release/pop‑off val...

Dec 5, 2025

Which brands of vacuum erection devices have FDA clearance as of 2025?

FDA-cleared vacuum erection devices (VEDs) exist and are regulated as Class II external penile rigidity devices; reputable clinical sources and FDA guidance note specific safety features such as pop-o...

Nov 30, 2025

How should a penis pump be used to avoid injury or bruising?

Use only the minimum vacuum needed, limit continuous pumping to roughly 15–20 minutes per session, use a water‑based lubricant and a constriction ring only as directed, and stop immediately for pain o...

Dec 21, 2025

Are there medical guidelines for safe pressure and duration when using a penis pump?

Medical authorities and patient-facing guides agree that vacuum erection devices (penis pumps) are an accepted, generally safe treatment for erectile dysfunction when used properly, but there is no un...

Dec 7, 2025

How should vacuum erection devices be used correctly and what are best-practice guidelines from urology societies?

Vacuum erection devices (VEDs) create a negative pressure to draw blood into the corpora cavernosa and use a constriction ring to maintain rigidity; FDA‑cleared models include pressure limiters and qu...

Nov 11, 2025

What is the normal semen volume range for men?

Clinical references are consistent that , but published “normal” ranges vary: major clinical guidelines set a lower threshold near , while other clinical and patient-facing resources report broader ra...

Dec 6, 2025

What are safe therapeutic doses of ivermectin for approved uses and how do they compare to doses people take recreationally?

Approved human ivermectin dosing for common parasitic indications is weight‑based and typically in the 150–200 micrograms per kilogram (mcg/kg) range as a single dose (for example, 0.15–0.2 mg/kg) . P...

Nov 28, 2025

What warning signs or injuries indicate I should stop using a penis pump and seek medical help?

Stop and seek medical help if you see persistent or severe bruising, purple/blue or black discoloration, pin‑point red spots (petechiae), numbness that doesn’t quickly resolve, severe pain, swelling t...