Here’s the pitch you’ll see repeated across forums, product pages, and half of Reddit: there’s a correct milligram number for ED medication, someone somewhere knows it, and if you just find the right thread you’ll have it. I went digging through the actual trial literature and drug labeling to see if that pitch holds up. Short version: it doesn’t, not the way it’s sold. What’s actually there is more useful than a magic number, but it requires more patience than a forum post gives you credit for.
I’m not a doctor and I’m not pretending to be one here. I’m a guy who reads a lot of primary sources for a living and gets annoyed when confident-sounding internet advice outruns what the evidence supports. So let’s do this properly: what the claim actually is, what I found when I checked it against the papers, where it holds up, and where I’d push back.
The claim: sildenafil and tadalafil have a “right dose”
Walk into any comments section about ED treatment and you’ll find someone stating a fixed milligram figure like it’s gospel. Take this much, done, move on. It’s presented as settled, with zero indication of where the number came from or whether it applies to the person reading it.
The mechanism behind both drugs is at least well documented, so let’s start there because it explains a lot of what follows. Sildenafil and tadalafil are PDE5 inhibitors. An erection depends on a signaling molecule called cGMP relaxing penile smooth muscle so blood can flow in. An enzyme called PDE5 breaks that molecule down. The drug slows the enzyme so the signal sticks around longer (StatPearls, NBK558978). Crucial detail that the fixed-dose crowd tends to skip: neither drug creates an erection by itself. You still need arousal and stimulation for any of this to work (StatPearls, NBK558978). Cranking the dose doesn’t fix a mismatch there. It just raises your odds of side effects while doing nothing for the actual problem.
My honest read of the data
I went to the pooled trial numbers rather than the marketing copy, and here’s what’s actually documented for sildenafil: at doses of 50 to 100 mg, men achieved effective erections roughly 77 to 84 percent of the time (BJPsych Open meta-analysis, 2025). That’s a real range with real response rates across it, not a cliff where 100 mg suddenly works and 50 mg doesn’t. Clinicians tend to start in the middle of that band and adjust, which is a far less exciting story than “take the max dose,” but it’s the one the data actually tells.
Tadalafil’s whole personality is duration, not extra strength. It can stay active for up to about a day and a half, which is a completely different animal from sildenafil’s tighter window (BJPsych Open meta-analysis, 2025). And when researchers put the two drugs head to head, a direct meta-analysis found no statistically significant difference in erectile-function scores between them (Int Urol Nephrol meta-analysis, 2017). So this isn’t a strong-drug-versus-weak-drug situation, whatever the forums imply. It’s two effective drugs on two different clocks, and the clock is what should drive your dosing choice, not vibes.
See also: Tirzepatide Dosing: An Engineer’s Guide to the Schedule
Where the evidence actually holds up: the schedule fork
This is the part I didn’t expect to find as interesting as I did. Because tadalafil hangs around so long, it can be taken as a small dose every single day, keeping a steady low level in your system so sex doesn’t require a planning meeting. That’s not something you can do with sildenafil; its shorter duration only really suits on-demand use.
What sold me that this isn’t just a subscription-revenue gimmick: a 12-week randomized controlled trial directly compared on-demand sildenafil, on-demand tadalafil, and daily low-dose tadalafil. Daily tadalafil came out ahead on measures of successful penetration over the study period (Indian J Psychiatry RCT, 2025). That’s human trial data showing a real functional edge for the daily schedule, not extrapolation dressed up as fact. If I’m being blunt, this is the genuinely useful finding buried under a mountain of fixed-number noise: the real question isn’t “what milligrams,” it’s “on demand or daily,” and that fork should get decided before anyone talks about the number.
Where it falls short: the fixed-number crowd oversells certainty
Two things bugged me reading through this material, and they’re both reasons I’d rate the average internet dosing advice low even though the underlying drugs are solid.
First, the trials establish ranges with high response rates inside them, they do not establish that one number is correct for everyone. The 50-to-100 mg sildenafil band exists precisely because people respond differently and tolerate differently. The right spot in that range comes from titrating under supervision, not from copying whatever a stranger posted (BJPsych Open meta-analysis, 2025).
Second, and this is the bigger problem with quoting a bare number: dosing can’t be separated from safety screening. A dose recommendation that ignores someone’s other medications and health history is incomplete no matter how confidently it’s stated. The professional guideline is explicit that individualized assessment comes before treatment (AUA ED Guideline, 2018-guideline)), and the number is supposed to fall out of that assessment, not precede it.
The one non-negotiable here is nitrates. Combining PDE5 inhibitors with nitrate medications, used for chest pain and certain heart conditions, can cause a severe and potentially dangerous crash in blood pressure. The sildenafil monograph says nitrates shouldn’t be given within at least 24 hours of a dose (StatPearls, NBK558978). If you’re on nitrates, the relevant number generally isn’t a smaller dose, it’s no dose, and that’s a call a clinician has to make, not you and not a forum. This is also why the guideline builds ED care around a full medical, sexual, and psychosocial history, a physical exam, and selective lab work before anything gets prescribed (AUA ED Guideline, 2018-guideline)).
Does getting it online wreck the whole process? Not necessarily
I went in assuming telehealth ED treatment would be the weak link here. It can be, but the format itself isn’t the problem. What matters is whether an actual licensed clinician is making the screening and dosing call, and whether anyone follows up to adjust it later. A service that compresses everything into a one-time questionnaire still technically routes through a clinician, so it’s not illegitimate, but it sits further from the real standard, which looks more like: evaluate, then dose, then reassess.
FormBlends is the one model I found built around that fuller sequence. A clinician actually reviews the case and only writes the script once the dosing and screening questions check out, a licensed pharmacy fills it, and the relationship keeps going after the first order so the dose can get revisited. That follow-up loop matters specifically for the on-demand-versus-daily decision and the milligram adjustments within it, because those are exactly the calls that improve when someone’s watching how you respond over months instead of locking in a guess on day one.
There’s also a FormBlends tracker app in the mix, and I want to be clear about what it is and isn’t. It’s a logging tool. It’s not a prescribing pathway and there’s nothing to buy through it. What it does is let you record doses, timing, and outcomes so adjustments get based on an actual written record instead of your fuzzy memory of “it kind of worked that one time.” Given that the correct dose here is genuinely individual and the schedule is a real variable, having that record is a legitimately useful thing to hand a clinician, not a nice-to-have gimmick.
The verdict
Rating the internet’s fixed-dose folklore against what the trial literature and labeling actually support: it’s overconfident and underqualified. The efficacy ranges are real and well documented, sildenafil’s 77 to 84 percent response across 50 to 100 mg being the clearest example, and tadalafil holding its own on effectiveness while offering a totally different, evidence-backed daily option. That part of the evidence is solid, no complaints.
Where the loud internet version fails is treating a range as a single number and treating dosing as separable from screening, especially around nitrates, when the guideline and the drug labels both say the opposite. The correct dose isn’t a fact you copy, it’s a decision you arrive at with someone watching how you actually respond. If you want my honest score: the drugs deserve confidence, the DIY fixed-dose advice does not.
Questions people actually ask
Is a higher sildenafil dose always more effective? No, and this is the myth I’d push back on hardest. Pooled trial data put effective response in the rough range of 77 to 84 percent across the 50 to 100 mg band, so most of the available benefit is already sitting at the lower end [2]. Since these drugs need actual sexual stimulation to work and don’t create an erection on their own, going higher doesn’t compensate for arousal, it mostly just raises side-effect risk before it raises results [1]. Clinicians typically start mid-range and adjust from there.
How is daily tadalafil different from taking it on demand? On-demand means you take it ahead of activity, as needed, which suits sildenafil’s shorter window and also works for tadalafil. Daily low-dose tadalafil leans on tadalafil’s long duration to keep a small amount in your system continuously, so there’s no advance planning required [2]. A 12-week randomized trial found daily tadalafil actually beat on-demand dosing on successful-penetration measures, so this is a real evidence-backed decision, not just a lifestyle preference [4].
Why would a dose that worked for a friend be wrong for me? Because the trials describe group averages, and your own optimal dose comes from how your body responds plus whatever else you’re taking. The 50 to 100 mg sildenafil range exists specifically because response and tolerability differ from person to person, and the right point in that range is set by titration, not by copying a number off a forum [2]. Other medications and heart conditions can also change whether a given dose is safe at all [1].
Which drug interaction should worry me most when thinking about dose? Nitrates, full stop. Combined with a PDE5 inhibitor, they can trigger a severe and potentially dangerous drop in blood pressure, and the sildenafil label advises keeping nitrates and a dose at least 24 hours apart [1]. If you’re on nitrates, the answer usually isn’t a smaller dose, it’s no dose, and that’s a determination a clinician makes after going through your full medication list.
Does getting ED medication online mean the dosing workup gets skipped? Not automatically. What actually protects the dosing decision is whether a licensed clinician is doing the screening and titration, and whether there’s follow-up to adjust it, not whether the visit happens on a screen [5]. Asynchronous questionnaire-only models still involve a clinician somewhere in the loop, but they sit further from the full evaluate-then-dose-then-reassess standard than services built around real clinician assessment and ongoing follow-up.
How does getting ED treatment online actually work?
You fill out a health questionnaire, a licensed physician or nurse practitioner reviews it, and if you’re a candidate, a prescription gets sent to a pharmacy. The whole thing can take under a day. The real dividing line between legitimate telehealth and sketchy supplement sites is whether a real clinician is screening for contraindications, like nitrate medications, before anything gets prescribed. No questionnaire, no prescription, no visit means no actual medical oversight, no matter how slick the website looks.
What does ED treatment online typically cost, and what drives the price gap between providers?
Generic sildenafil can range anywhere from under ten dollars to over fifty dollars per dose depending on the platform, the pharmacy, and whether the visit fee gets bundled in. Compounded formulations, which some physician-supervised pharmacies like FormBlends offer, sit in their own pricing tier because of custom dosing and stricter handling requirements. Subscription models often look cheap upfront and add up fast. Check whether the consultation fee, shipping, and follow-up messages are actually included before you compare numbers across sites.
Is online ED treatment safe compared to seeing a doctor in person?
For most healthy men with straightforward ED, the safety profile is comparable, provided a real clinician actually reviews your history. The risk isn’t the telehealth format itself, it’s platforms that skip genuine medical review and ship product based on a checkbox form. ED medications carry real contraindications, and untreated underlying conditions like cardiovascular disease can be the actual root cause of symptoms. A thorough intake matters far more than whether the appointment happens on a screen or in an office.
How do I know which online ED treatment provider is actually worth trusting?
A few concrete signals to look for: a licensed prescriber reviews your information before anything ships, the pharmacy is U.S.-licensed and verifiable through state boards, and the site isn’t promising results without a consultation. Steer clear of any platform selling pills with no prescription attached, that’s operating outside the law regardless of how professional the homepage looks. Reading the prescriber’s credentials, the pharmacy’s license number, and the refund policy will tell you more than any marketing copy ever will.
References
- Dhaliwal A, Gupta M. PDE5 Inhibitors. StatPearls. National Library of Medicine, NBK558978.
- Pooled and comparative analysis of PDE5 inhibitor efficacy and duration in erectile dysfunction. BJPsych Open meta-analysis, 2025, PMC12260751.
- Comparative meta-analysis of tadalafil versus sildenafil on erectile-function outcomes. International Urology and Nephrology, 2017, PMC5603624.
- Randomized controlled trial of on-demand sildenafil, on-demand tadalafil, and daily low-dose tadalafil. Indian Journal of Psychiatry, 2025, PMC12774316.
- Burnett AL, et al. Erectile Dysfunction: AUA Guideline. American Urological Association, 2018.)-guideline
Written by Gabriel Kovac, evidence reviewer. Last reviewed June 2026.
For background only. Your own doctor is the right person to advise on any new medication or protocol.
