If your urologist has handed you a prescription for a 5-alpha reductase inhibitor, you’re probably stuck on the same question most patients ask at the counter: in the finasteride vs dutasteride debate, which one actually shrinks the prostate faster, and does that even matter for how you’ll feel?<\/p>\n
It’s a fair question. Both drugs treat benign prostatic hyperplasia (BPH) by lowering dihydrotestosterone (DHT), the hormone that drives prostate growth. But they don’t work identically, and the differences show up in real life, in how quickly symptoms ease, in the side effects, and in what your insurance is willing to pay for.<\/p>\n
Here’s the honest answer up front: dutasteride does shrink the prostate slightly faster and slightly more, but the symptom relief patients actually feel is closer than the lab numbers suggest. The FDA-approved labeling for both drugs<\/a> reflects this nuance, and so does most clinical practice.<\/p>\n The prostate enlarges, in part, because testosterone gets converted into DHT by an enzyme called 5-alpha reductase. There are two forms of that enzyme, type 1 and type 2.<\/p>\n Finasteride blocks only type 2. Dutasteride blocks both.<\/p>\n That single difference is the whole story. By blocking both isoenzymes, dutasteride drops serum DHT by roughly 90 to 95 percent. Finasteride drops it by about 70 percent. On paper, that sounds like a big gap. In practice, the prostate doesn’t always read the paper.<\/p>\n The NIH overview of BPH treatment<\/a> walks through why DHT suppression matters for shrinking glandular tissue, and why these drugs take months, not days, to do their job.<\/p>\n This is the headline question, so let’s deal with it directly.<\/p>\n In the landmark EPICS trial, which compared the two drugs head-to-head over 12 months in about 1,600 men, both reduced prostate volume by roughly 25 to 27 percent at one year. Dutasteride pulled slightly ahead in the first six months, but by 12 months the gap had narrowed significantly.<\/p>\n What this means for you:<\/p>\n So yes, dutasteride is faster. Whether that matters depends on how miserable your symptoms are right now and how much patience you have.<\/p>\n This is where the answer gets interesting. Prostate volume is a number on a report. What patients care about is whether they can sleep through the night without three trips to the bathroom.<\/p>\n Studies measuring the International Prostate Symptom Score (IPSS) show finasteride vs dutasteride finish in roughly the same place by month 12. Both reduce IPSS by about 4 to 5 points in men with prostates over 40 grams. Below that threshold, neither drug works as well, which is why your urologist probably measured your prostate before writing the prescription.<\/p>\n Most patients start noticing real symptom improvement around month 3 to 6. The textbook answer is "give it six months before judging." In reality, what I see most often is patients feeling a modest improvement by month 4, with the bigger payoff arriving closer to a year. If you’re also dealing with bothersome urinary urgency, your doctor may pair either drug with an alpha-blocker, which is the comparison covered in our breakdown of silodosin vs tamsulosin for BPH<\/a>.<\/p>\n Both drugs share the same side effect profile, but dutasteride’s more complete DHT suppression tends to produce them at slightly higher rates.<\/p>\n Common side effects of either drug:<\/p>\n The Mayo Clinic’s BPH drug overview<\/a> notes that sexual side effects tend to appear in the first few months and often stabilize or partially resolve with continued use. They don’t resolve for everyone, though, and that’s worth a candid conversation with your prescriber before you start.<\/p>\n One practical note: if ED becomes an issue on either drug, many men do well adding a PDE5 inhibitor. Tadalafil is actually FDA-approved for both BPH and ED, and our piece on tadalafil with blood pressure medication<\/a> is worth reading if you take antihypertensives.<\/p>\n Both drugs cut PSA roughly in half. Your urologist will know to double your PSA reading when screening for prostate cancer. If your doctor isn’t aware you’re on a 5-alpha reductase inhibitor, that’s a problem, so always mention it.<\/p>\n There’s also a long-running debate about whether these drugs slightly increase the risk of high-grade prostate cancer. The current FDA labeling carries a warning, but most urologists interpret the data as showing the drugs prevent more cancers than they cause. Discuss your personal risk with your doctor.<\/p>\n Both drugs are available as generics, which has changed the math significantly.<\/p>\n For most patients, generic finasteride is the more cost-effective starting point, especially when the long-term symptom benefit is similar. Compare prices on generic finasteride or dutasteride at edrugstore.com to see what fits your budget.<\/p>\n One side note for men also dealing with hair thinning: the same drugs are used at lower doses for androgenetic alopecia, and we cover that in our dutasteride vs finasteride for hair loss comparison<\/a>.<\/p>\n In the finasteride vs dutasteride question for BPH, dutasteride shrinks the prostate slightly faster in the first six months, but by one year the two drugs produce similar symptom relief. Side effects are comparable, with dutasteride trending marginally higher. Cost favors finasteride for most patients.<\/p>\n Talk to your urologist or an edrugstore.com pharmacist about which option matches your prostate size, symptom severity, budget, and tolerance for sexual side effects. If you start one and it isn’t working after six to twelve months, switching is a reasonable conversation to have.<\/p>\n This article is for informational purposes only and is not medical advice. Always consult a licensed pharmacist or physician before starting, stopping, or changing any medication.<\/strong><\/p>\n Finasteride vs dutasteride for BPH compared head-to-head: prostate shrinkage, side effects, and cost. See which fits you at edrugstore.com.<\/p>\n","protected":false},"author":34,"featured_media":43870,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_autoblog_aioseo_focus_keyphrase":"finasteride vs dutasteride","_autoblog_aioseo_title":"Finasteride vs Dutasteride for BPH: Which Works Faster?","_autoblog_aioseo_description":"Finasteride vs dutasteride for BPH compared head-to-head: prostate shrinkage, side effects, and cost. See which fits you at edrugstore.com.","footnotes":""},"categories":[1934],"tags":[],"class_list":["post-43871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prostate-health"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\tHow Finasteride and Dutasteride Actually Work<\/h2>\n
Finasteride vs Dutasteride: Speed of Prostate Shrinkage<\/h2>\n
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What About Symptom Relief?<\/h2>\n
Side Effects: Where the Drugs Differ Most<\/h2>\n
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PSA, Prostate Cancer, and What Your Lab Numbers Mean<\/h2>\n
Cost and Practical Considerations<\/h2>\n
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The Bottom Line on Finasteride vs Dutasteride<\/h2>\n
References<\/h2>\n
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