Preparation H can temporarily relieve some symptoms of internal hemorrhoids, particularly discomfort during bowel movements and minor bleeding, but it does not shrink or cure them. The product’s active ingredients address surface-level symptoms like irritation and swelling of the tissue lining, and suppository forms can deliver those ingredients to internal hemorrhoid tissue specifically. For mild, early-stage internal hemorrhoids, that symptomatic relief is often all a person needs while lifestyle changes take effect. For more advanced internal hemorrhoids that prolapse or bleed heavily, Preparation H is unlikely to be enough on its own.
What Internal Hemorrhoids Actually Are
Hemorrhoids are cushions of vascular tissue that everyone has. They become a problem when those cushions swell, slip out of position, or start bleeding. Internal hemorrhoids sit above the dentate line, a boundary inside the anal canal, and their hallmark symptoms are painless bleeding and prolapse rather than the acute pain associated with external hemorrhoids.1PubMed Central. Hemorrhoids That distinction matters for treatment because internal hemorrhoids are covered by a type of tissue that lacks the same pain-sensing nerve fibers found on the skin outside the anus. You can have a significant internal hemorrhoid and feel nothing except occasional bright red blood on the toilet paper.
Internal hemorrhoids are commonly graded on a four-point scale. Grade I hemorrhoids bleed but don’t prolapse. Grade II prolapse during straining but retract on their own. Grade III prolapse and need to be pushed back in manually. Grade IV are permanently prolapsed and can’t be repositioned. Preparation H is most relevant for grades I and II, where the tissue is still mostly inside the canal and symptoms are limited to bleeding and mild discomfort. By the time you’re at grade III or IV, over-the-counter products are generally a stopgap measure at best, and procedural treatments become the standard recommendation.
What Preparation H Contains and How Each Ingredient Works
Preparation H is sold in several formulations, and the active ingredients vary depending on whether you pick up the original, the “cooling gel,” or the hydrocortisone version. Understanding what’s in the box you’re buying matters because the ingredients target different symptoms.
The flagship suppository contains phenylephrine hydrochloride as its active drug ingredient. Phenylephrine is a vasoconstrictor: it temporarily narrows blood vessels in the tissue it contacts, which reduces local swelling. In the context of internal hemorrhoids, that narrowing can modestly decrease the engorgement of the hemorrhoidal cushion. The product label states that it “temporarily provides a coating for relief of anorectal discomforts” and “temporarily protects the inflamed, irritated anorectal surface to help make bowel movements less painful.”2DailyMed. 0.25 % PHENYLEPHRINE HCL HEMORRHOIDAL That language is carefully chosen. “Temporarily” is doing a lot of work there. The coating and vasoconstriction wear off within hours, so you’re managing symptoms on a dose-by-dose basis, not reversing the underlying problem.
The hydrocortisone version of Preparation H uses a low-dose corticosteroid instead of or alongside phenylephrine. Hydrocortisone suppresses local inflammation, which helps with itching and irritation. It’s more useful for the burning, itchy symptoms that can accompany internal hemorrhoids, especially when there’s mucous discharge irritating the surrounding skin. However, hydrocortisone shouldn’t be used long-term on this tissue. Extended use can thin the already delicate mucosal lining, potentially making the hemorrhoid problem worse over time. Most labels and guidelines recommend limiting hydrocortisone-containing products to about a week of continuous use before checking in with a doctor.
Other inactive ingredients in Preparation H formulations, like cocoa butter and shark liver oil (in some older formulations) or petrolatum, serve as protectants. They create a physical barrier on the tissue surface, reducing friction during bowel movements and giving inflamed tissue a chance to calm down. These protectants don’t have pharmacological effects on the hemorrhoid itself but can make a meaningful difference in day-to-day comfort.
Suppositories Versus Ointments for Internal Hemorrhoids
If your hemorrhoids are internal, the formulation you choose matters more than people realize. An ointment applied to the outside of the anus doesn’t effectively reach internal hemorrhoid tissue sitting above the dentate line. Suppositories, by contrast, are inserted into the anal canal and dissolve in place, delivering the active ingredient directly to the internal tissue where it’s needed.
A clinical trial comparing suppository and ointment formulations for second-degree hemorrhoids found that both achieved symptom control exceeding 90% after three weeks of therapy. Suppositories provided slightly faster relief from pain and itching in the early stages, while both forms were similarly effective at reducing bleeding over the full treatment course.3PubMed. Comparative efficacy and tolerability of two ointment and suppository preparations (‘Uniroid’ and ‘Proctosedyl’) in the treatment of second degree haemorrhoids in general practice The takeaway for someone with confirmed internal hemorrhoids is that a suppository gives you the best chance of actually getting the drug where it needs to go. Ointments are more practical for external symptoms or when a hemorrhoid has prolapsed and is accessible from outside.
Some Preparation H products come with an applicator tip designed for internal use with the ointment formulation. If you go that route, the applicator does help deposit ointment inside the canal, though it’s less precise than a suppository that stays in place and dissolves gradually.
How Strong Is the Clinical Evidence?
Here’s where things get a bit deflating. Preparation H is one of the best-known over-the-counter hemorrhoid treatments in the world, but the clinical trial evidence supporting it specifically is surprisingly thin. Most of the published research on OTC hemorrhoid treatments tests individual active ingredients, like phenylephrine or hydrocortisone, rather than the branded product.
One randomized controlled trial that directly tested phenylephrine suppositories for acute hemorrhoids used them as the active control group against an experimental treatment. In that trial, the phenylephrine suppositories achieved a complete response rate of about a third of patients by day five, with that figure climbing to around 58% by day ten.4PubMed Central. Recombinant streptokinase vs phenylephrine-based suppositories in acute hemorrhoids, randomized, controlled trial (THERESA-3) Those numbers are worth knowing because they set realistic expectations. More than half of people did see their acute symptoms resolve within about ten days on phenylephrine suppositories, but a substantial minority didn’t, and the experimental drug in the trial significantly outperformed them. In other words, phenylephrine suppositories work, but they aren’t especially powerful.
For hydrocortisone suppositories specifically, one controlled trial comparing them with an herbal alternative for bleeding internal hemorrhoids found that the hydrocortisone group showed improvement, though the herbal preparation was reported to outperform it in reducing pile mass size and bleeding.5International Journal of Ayurvedic Medicine. Comparative evaluation of the efficacy of Hydrocortisone suppository and Durvadi Gudavarti in Raktarsha – A randomized controlled clinical trial That trial is small and shouldn’t be overinterpreted, but it does highlight that hydrocortisone suppositories are not a slam-dunk even compared to non-pharmaceutical alternatives.
The honest picture is that Preparation H delivers real but modest symptom relief for internal hemorrhoids. It doesn’t cure the underlying vascular problem, and the evidence base is thinner than you’d expect for a product this ubiquitous. Most colorectal specialists view it as a reasonable first step for mild symptoms, not as definitive treatment.
Safety Concerns and Who Should Be Careful
For most people, short-term use of Preparation H is safe. But the product labels carry several warnings that are easy to overlook. The phenylephrine formulation specifically advises checking with a doctor before use if you have heart disease, high blood pressure, thyroid disease, diabetes, or difficulty urinating due to an enlarged prostate. You should also consult a doctor or pharmacist if you’re currently taking prescription medication for high blood pressure or depression.6DailyMed. PREPARATION H- phenylephrine hydrochloride suppository Phenylephrine is a vasoconstrictor, and while the dose absorbed systemically from a rectal suppository is small, it can interact with medications that affect blood pressure.
A large observational study of a hydrocortisone combination ointment used for hemorrhoids found no adverse reactions across 578 patients, with about three-quarters of them having internal hemorrhoids and a median treatment duration of 20 days.7PubMed Central. A Clinical Investigation into the Long-term Use and Safety of Killed Escherichia coli Suspension-Hydrocortisone Combination Ointment for the Treatment of Hemorrhoids That’s reassuring for typical use periods, but “20 days” is already pushing the boundary of what most guidelines consider safe for continuous rectal hydrocortisone. If you’re still reaching for the product after two or three weeks, your hemorrhoids likely need a different approach.
One important safety note that’s really about diagnosis rather than the product itself: rectal bleeding should not be assumed to be hemorrhoids without evaluation by a healthcare provider, especially if you’re over 45 or have risk factors for colorectal cancer. Self-treating with Preparation H for months while ignoring persistent bleeding can delay the diagnosis of something more serious. If bleeding doesn’t improve within a week, or if it’s accompanied by changes in bowel habits or unexplained weight loss, get it checked out.
Fiber, Flavonoids, and Other Treatments That Pair With or Replace It
Preparation H works best as part of a broader approach to managing internal hemorrhoids, not as a standalone fix. The most evidence-backed companion measure is increasing dietary fiber intake. A study on fiber supplementation for internal bleeding hemorrhoids concluded that added fiber improved symptoms, though not immediately, and recommended it particularly for patients waiting for a more definitive treatment or who had contraindications to invasive procedures.8PubMed. Effect of fiber supplements on internal bleeding hemorrhoids Fiber works by softening stool and reducing the straining that engorges hemorrhoidal tissue. It addresses a root cause rather than a symptom, which is why most specialists consider it the single most important conservative intervention.
A class of supplements called phlebotonics, particularly a product called micronized purified flavonoid fraction (sold under brand names like Daflon in many countries), has accumulated substantial evidence for hemorrhoid symptom relief. A Cochrane systematic review found that phlebotonics significantly reduced itching, bleeding, and overall symptoms compared to control treatments.9PubMed Central. Phlebotonics for haemorrhoids A randomized trial found that combining micronized purified flavonoid fraction with fiber stopped hemorrhoidal bleeding faster than fiber alone, with mean resolution in about four days compared to roughly eleven days for fiber by itself.10PubMed. Micronized purified flavonidic fraction compared favorably with rubber band ligation and fiber alone in the management of bleeding hemorrhoids: randomized controlled trial These supplements are widely available outside the United States and increasingly discussed among gastroenterologists, though they haven’t penetrated the U.S. mainstream the way Preparation H has.
For internal hemorrhoids that don’t respond to conservative measures, office-based procedures like rubber band ligation are the next step up. Banding involves placing a small rubber band around the base of the internal hemorrhoid to cut off its blood supply, causing it to shrink and fall off within days. It’s quick, doesn’t require anesthesia for most people, and is the most common procedural treatment for grade I through III internal hemorrhoids. Compared to topical products, banding addresses the physical anatomy of the problem rather than just the symptoms. Surgical hemorrhoidectomy is reserved for severe or recurrent cases where everything else has failed.
Pregnancy and Internal Hemorrhoids
Internal hemorrhoids are extremely common during pregnancy, particularly in the third trimester, due to increased pelvic pressure and hormonal changes that relax vein walls. Many pregnant people reach for Preparation H as a first instinct. The safety picture is nuanced: none of the topical anti-hemorrhoidal agents commonly used, including the anesthetics, corticosteroids, and anti-inflammatory agents in products like Preparation H, have been formally assessed for safety in pregnancy. However, it’s considered unlikely that these ingredients would harm a third-trimester infant given the low systemic absorption from rectal application.11PubMed Central. Hemorrhoids in pregnancy The reassuring reality is that in most women, hemorrhoid symptoms resolve on their own soon after delivery as pelvic pressure drops.
If you’re pregnant and dealing with internal hemorrhoids, fiber supplementation and keeping stools soft is generally the safest first-line approach. If you do use Preparation H, the phenylephrine formulation deserves more caution than the protectant-only or hydrocortisone versions, given phenylephrine’s vasoconstrictive properties and the potential for blood pressure effects, however small. Talk to your OB about what’s appropriate for your situation, especially if you have pregnancy-related hypertension.
Why People Expect More From Preparation H Than It Can Deliver
The gap between what Preparation H actually does and what people expect it to do is probably the most important thing to understand about this product. Marketing and word-of-mouth have given it a reputation as a cure for hemorrhoids, full stop. In reality, it’s a symptom-management tool for mild cases, and a temporary one at that. The vasoconstricting and anti-inflammatory effects wear off within hours of each application. The protectant coating helps during bowel movements but doesn’t persist throughout the day. Nothing in the formulation reverses the dilation and displacement of the vascular cushion that constitutes the actual hemorrhoid.
This matters because people often use Preparation H for weeks or months, assuming they just need to give it more time, when what they actually need is a different tier of treatment. Grade I internal hemorrhoids that cause occasional spotting after straining? Preparation H plus fiber and softer stools is a perfectly reasonable approach. Grade II or III internal hemorrhoids that bleed regularly and prolapse? You’re past the point where an over-the-counter product is likely to solve the problem, and delaying a doctor visit just means living with symptoms longer than necessary.
The product also can’t address the mechanical problem of prolapse. An internal hemorrhoid that has stretched and begun to slide out of the anal canal isn’t going to be coaxed back into position by a vasoconstrictor or a hydrocortisone suppository. Banding, sclerotherapy, or surgery are the tools for that job. Preparation H can make the prolapsed tissue less uncomfortable in the meantime, which has real value, but expecting it to fix the prolapse is like expecting ibuprofen to heal a broken bone: it helps with the pain, not the structure.
Sitz Baths and Practical Day-to-Day Measures
Alongside or instead of Preparation H, warm sitz baths remain one of the simplest and most effective comfort measures for internal hemorrhoids. Sitting in a few inches of warm water for 10 to 15 minutes after bowel movements relaxes the anal sphincter, improves local blood flow, and reduces the sensation of pressure. You can buy a plastic sitz bath basin that fits over a standard toilet seat for a few dollars. No medication needed.
Avoiding straining during bowel movements is the single most impactful behavioral change you can make. Straining increases pressure in the hemorrhoidal veins, worsening engorgement and bleeding. If you’re spending more than a few minutes on the toilet, or if you find yourself bearing down hard, those habits are contributing to the problem. Adequate water intake, physical activity, and responding promptly to the urge to defecate all help keep things moving without force. Smartphones in the bathroom have become an underappreciated contributing factor: people sit much longer than necessary because they’re scrolling, and that prolonged time on the toilet puts sustained downward pressure on the pelvic floor.
Ice packs wrapped in a cloth and applied to the anal area can also reduce swelling and discomfort for external symptoms, though they’re less useful for truly internal hemorrhoids that aren’t prolapsed. Witch hazel pads, sold under brands like Tucks, provide a mild astringent effect and are sometimes used as a complement to Preparation H. They won’t reach internal tissue but can soothe the surrounding area when irritation extends beyond the anal canal.