Horny Goat Weed vs. Viagra: What the Evidence Says

The main difference is that Horny Goat Weed is a herbal supplement sold over the counter, while Viagra is a prescription medication.

Jack & Jill

Medically Reviewed By Mostafa Elhennawy MS, Pharm D

February 14, 2025

When it comes to treating erectile dysfunction (ED), men often find themselves choosing between natural remedies such as Horny Goat Weed and modern medications like Viagra.

Horny Goat Weed is a centuries-old herbal remedy rooted in traditional Chinese medicine, while Viagra is a prescription medication authorized for sale in Canada. Each treatment has unique benefits, mechanisms of action, and side effect profiles.

This article outlines what is known about each option so you can discuss them with a licensed healthcare professional.

About the Experts

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What is Horny Goat Weed (Icariin)?

Horny Goat Weed is also known as Epimedium and Yin Yang Huo. Its active component is icariin, which has been studied in laboratory models for effects on blood vessels and smooth muscle tissue. Beyond ED, Horny Goat Weed has been examined in traditional practice and in preclinical research for effects on aging and bone health. Traditional Chinese medicine links aging to kidney qi weakness, often manifesting as sexual dysfunction, contrasting with modern medical views that separate aging and sexual health.

Two clinical trials examined the effects of Horny Goat Weed on aged males. A 2013 study in Thailand evaluated 61 patients with mild to moderate ED using herbal medicine containing Epimedium versus placebo. The Epimedium group showed greater improvement in ED compared to placebo. In Japan, a trial studied Epimedium 49 aging males with mild to severe symptoms. Over six months, Epimedium recipients showed improvements in somatic and psychological aging outcomes, including ED.

How Does Viagra Work?

The demand for ED treatment has grown, and Viagra, the first PDE5 (phosphodiesterase type 5) inhibitor, has changed how the condition is treated medically. Nitric Oxide (NO) is released in the penis during sexual arousal, leading to Cyclic guanosine Monophosphate (cGMP) accumulation. Cyclic GMP improves penile blood flow by helping the muscles in the penis relax. ED is associated with decreased cGMP levels because PDE5 degrades cGMP in the penis, making erections difficult to achieve. Sildenafil, Viagra’s active substance, enhances the effect of NO by inhibiting PDE5, which helps sustain an erection.

Do Ginger, Garlic, and Honey Benefit Your Sex Life?

Natural remedies have traditionally been used for their potential to enhance sexual health, with ginger, garlic, and honey often taking center stage. These common kitchen ingredients are said to boost libido, improve stamina, and even enhance overall sexual performance.

Does Hydrogen Peroxide Help with ED? Risks You Should Know

Hydrogen peroxide (H2O2) has been suggested as an unconventional option for helping with ED. Some claim it improves blood circulation and cellular oxygenation, but how much is backed by science, and what are the risks?

Is Baking Soda Good for ED or a Fad? A Surprising Discovery

Baking soda has gained attention as a potential home remedy for erectile dysfunction (ED), sparking curiosity and debate. Advocates claim that its alkaline properties can improve blood circulation and overall health, indirectly aiding ED.

Does Sildenafil (Viagra) Expire Too Soon? Read Before Use

Sildenafil tablets, like Viagra, typically have a shelf life of about two years from the manufacturing date. Over time, their effectiveness and performance can decrease due to chemical degradation.

Rapid Weight Loss Causing Erectile Dysfunction: Myth or Reality?

Do you want to lose weight but fear it might harm your sexual well-being? Losing weight quickly impacts more than just your appearance. It may also influence your intimate health.

Foods for Erectile Dysfunction: Fruits, Veggies, and More

Diet directly affects erectile function. Specific foods can improve blood flow, balance hormones, and support stronger erections. While ED often requires medical treatment, adding the right foods to your diet can help with mild to moderate symptoms.

Losing Erection Quickly During Sex? Causes and Solutions

Experiencing a loss of erection during sex is a common challenge many men face, and it’s as normal as it is treatable. This sudden shift in sexual performance can cause worry and questions, but it's important to remember you're not alone in this.

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How Long Do Blue Balls Last? Causes and Treatment

“Blue balls” is a condition often discussed in the context of men's sexual health. It refers to a temporary discomfort or pain in the testicles, which can occur when orgasm does not follow sexual arousal.

Obesity and Erectile Dysfunction: The Heavy Cost of Weight

Obesity, characterized by excess body weight, plays a key role in male sexual dysfunction, including premature ejaculation and erectile dysfunction (ED).

Can Belly Fat Cause Erectile Dysfunction? Obesity & Sexual Health

Belly fat does increase the risk of erectile dysfunction (ED) alongside other health issues like heart disease, type 2 diabetes, and metabolic syndrome. Excess visceral fat affects penile health indirectly through systemic issues by lowering testosterone and impairing erections.

Does High Testosterone Cause Erectile Dysfunction?

Excess testosterone has not been proven to cause erectile dysfunction (ED); instead, higher bioavailable testosterone should improve ED and libido levels.

How to Increase Blood Flow to the Penis Naturally

Blood flow to the penis can be increased naturally by exercising regularly, maintaining a healthy diet, and implementing lifestyle changes. A healthcare professional should be consulted for individualized medical advice if the desired improvements are not seen.

Horny Goat Weed vs. Viagra: What is the Difference?

The main difference is that Horny Goat Weed is a herbal supplement sold over the counter, while Viagra is a prescription medication authorized for sale in Canada and available only with a prescription.

Benefits for ED

Icariin, the active ingredient in Horny Goat Weed, has been suggested to increase NO synthesis in the penis, inhibit PDE5, positively affect nitrergic nerves, enhance smooth muscle proliferation, and mimic endogenous androgens. Like with other herbal supplements, there’s limited evidence of Horny Goat Weed’s health benefits. Viagra treats ED by improving blood flow to the penis during sexual arousal.

Side Effects

Horny Goat Weed may cause:

a rapid, irregular heartbeat
sweating or feeling hot
an increase in energy
mood changes
fainting
low blood pressure
an increased risk of bleeding
prolonged blood clotting
severe breathing problems
spasms
dizziness
vomiting
dry mouth
thirst
nose bleed

Patients with hormone-sensitive cancers or heart disease should avoid Horny Goat Weed.

Viagra’s side effect profile includes:

headache
nausea
hot flushes
indigestion
stuffy nose
dizziness
temporary vision issues
chest pain
myalgia
nosebleed
dry eyes
fainting
tinnitus
low blood pressure
sudden hearing loss

Viagra may interact with prescriptions, such as blood pressure medications and antidepressants.

How to Use

Horny Goat Weed is available as a capsule, tablet, powder, or tea. Horny Goat Weed can also be found in combination with other supplements. There is insufficient reliable information regarding an appropriate dose of Horny Goat Weed. Before using, follow the directions on the product label and consult with a healthcare professional. Viagra is taken orally in 25 mg, 50 mg, and 100 mg doses. It is taken 1 hour before intercourse, with a maximum frequency of once daily. Sexual stimulation is required for effectiveness. A high-fat meal delays absorption, but alcohol does not impact regular doses.

Pricing

In general, Horny Goat Weed is less expensive than Viagra, but the prices of both can vary greatly. Horny Goat Weed prices vary depending on the brand, added ingredients, and dose. For instance, a 750 mg oral tablet is around $12.52 for a supply of 90 tablets. The cost for Viagra 50 mg oral tablet is around $2,771 for a supply of 30 tablets. The cost for sildenafil 100 mg oral tablet is around $10 for a supply of 2 tablets.

Is Horny Goat Weed Like Viagra?

Laboratory studies suggest that icariin, the active component of Horny Goat Weed, has some PDE5-inhibiting activity, but this has not been shown to produce a comparable clinical effect in people. While some studies suggest that it may help boost libido and erectile function, more research is needed to confirm these findings.

Does Horny Goat Weed work as fast as Viagra?

Horny Goat Weed should be taken orally 90 minutes before planned sexual activity. Horny Goat Weed may stay in the system for 12 to 36 hours. Viagra expires after about 24 hours. Another PDE5 inhibitor, tadalafil, may expire after 72 hours. Viagra is usually taken only when needed, 30 minutes to 1 hour before sexual activity. It can be taken up to 4 hours before sexual activity.

How Horny Goat Weed and Viagra Compare

Horny goat weed is a herbal supplement; it is not an authorized treatment for erectile dysfunction. Sildenafil is a prescription medicine that a clinician may prescribe for erectile dysfunction, while horny goat weed lacks conclusive scientific support for that use. Consult a healthcare provider to determine the best option. For supplements, ensure quality by buying from reliable sources to avoid contamination or mislabeling.

Frequently Asked Questions

Can you use Horny Goat Weed and Viagra together?

No, using Horny Goat Weed extract and Viagra together should be avoided due to possible herb-drug interactions.

How long does the effect of Horny Goat Weed last compared to Viagra?

Horny Goat Weed may stay in the system for 12 to 36 hours, though this has not been confirmed by regulators. Viagra remains effective for 30 minutes to 4–5 hours, with some cases extending up to 12 hours.

Is Icariin suitable for long-term use for ED?

Long-term safety has not been established. Studies have used Horny Goat Weed extract with phytoestrogens for up to two years and icariin-containing extracts for up to six months. Prolonged or high-dose use may be unsafe and cause severe side effects, such as breathing difficulties.

Key Takeaways

Horny Goat Weed is a herbal supplement used in traditional Chinese medicine, whereas Viagra is a prescription medication that must be prescribed by a licensed healthcare professional.

Evidence for Horny Goat Weed in ED is limited, and it has not been compared with prescription treatments in adequate head-to-head trials.

Viagra is more expensive and requires a prescription to purchase, whereas Horny Goat Weed can be purchased over the counter for a lower price.

Sources

Shindel AW, Xin ZC, Lin G, Fandel TM, Huang YC, Banie L, Breyer BN, Garcia MM, Lin CS, Lue TF. Erectogenic and neurotrophic effects of icariin, a purified extract of horny goat weed (Epimedium spp.) in vitro and in vivo. J Sex Med. 2010 Apr;7(4 Pt 1):1518-28. doi: 10.1111/j.1743-6109.2009.01699.x. Epub 2010 Feb 5. PMID: 20141584; PMCID: PMC3551978.

https://sci-hub.se/https://doi.org/10.1002/9781118543436.ch58

https://www.sciencedirect.com/science/article/pii/S2405844023084347

Punyawudho B, Puttilerpong C, Wirotsaengthong S, Aramwit P. A randomized, double-blind, placebo-controlled crossover study of Cappra® for the treatment of mild or mild to moderate erectile dysfunction in Thai male. Afr J Tradit Complement Altern Med. 2012 Dec 31;10(2):310-5. PMID: 24146455; PMCID: PMC3746578.

Nishimatsu H, Kitamura T, Yamada D, Nomiya A, Niimi A, Suzuki M, Fujimura T, Fukuhara H, Nakagawa T, Enomoto Y, Kume H, Igawa Y, Homma Y. Improvement of symptoms of aging in males by a preparation LEOPIN ROYAL containing aged garlic extract and other five of natural medicines – comparison with traditional herbal medicines (Kampo). Aging Male. 2014 Jun;17(2):112-6. doi: 10.3109/13685538.2013.771328. PMID: 24844765.

Hatzimouratidis K. Sildenafil in the treatment of erectile dysfunction: an overview of the clinical evidence. Clin Interv Aging. 2006;1(4):403-14. doi: 10.2147/ciia.2006.1.4.403. PMID: 18046917; PMCID: PMC2699643.

Horny Goat Weed

Feldman HA, Goldstein I, Hatzichristou DG, Krane RJ, McKinlay JB. Impotence and its medical and psychosocial correlates: results of the Massachusetts Male Aging Study. J Urol. 1994 Jan;151(1):54-61. doi: 10.1016/s0022-5347(17)34871-1. PMID: 8254833.

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Horny Goat Weed vs. Viagra: What the Evidence Says

About the Experts

What is Horny Goat Weed (Icariin)?

How Does Viagra Work?

Horny Goat Weed vs. Viagra: What is the Difference?

Is Horny Goat Weed Like Viagra?

How Horny Goat Weed and Viagra Compare

Frequently Asked Questions

Key Takeaways

Jack & Jill Health is not a pharmacy or drug manufacturer.

JackHealth is not a pharmacy
or drug manufacturer.

JackHealth is not a pharmacy
or drug manufacturer.

Horny Goat Weed vs. Viagra: What the Evidence Says

About the Experts

What is Horny Goat Weed (Icariin)?

How Does Viagra Work?

Horny Goat Weed vs. Viagra: What is the Difference?

Is Horny Goat Weed Like Viagra?

How Horny Goat Weed and Viagra Compare

Frequently Asked Questions

Key Takeaways

Jack & Jill Health is not a pharmacy or drug manufacturer.

JackHealth is not a pharmacy or drug manufacturer.

JackHealth is not a pharmacy or drug manufacturer.

Select your store

JackHealth is not a pharmacy
or drug manufacturer.

JackHealth is not a pharmacy
or drug manufacturer.