Ro Sparks Review (2026): Price, Side Effects, How It Works

Ro Sparks is a compounded prescription ED treatment that puts sildenafil and tadalafil into one drop that dissolves under the tongue. Ro's safety information gives the strength as sildenafil 55 mg and tadalafil 22 mg in each dose. Ro calls it a "dual-action" formula: sildenafil for a fast start and tadalafil for a long window. Ro says it is a fruit-flavored drop, and Megan Fox appears in its advertising.

Sildenafil and tadalafil are both FDA-approved PDE5 inhibitors, sold as Viagra and Cialis and as cheap generics. The combination in one drop is not an FDA-approved product. Ro's own page says compounded medications "are not FDA-approved, but are permitted to be prescribed under federal law," and do not undergo FDA safety, effectiveness or manufacturing review.

Ro's Sparks page showed a 4.47 out of 5 rating from 274 patient reviews on October 30, 2026. The reviews Ro displays are mixed in the way real reviews usually are: some say it works well with no side effects, others say it is only partly effective. Ro also says almost 2,000,000 members have been treated for ED through Ro, which covers all its ED products, not Sparks alone.

Those are reviews on the seller's own page. The questions to answer for yourself are price per dose, whether you need two PDE5 inhibitors at once, and the 24-hour dosing rule.

Ro Sparks costs $12 a dose on a recurring monthly plan. Ro offers 4 to 14 doses a month, from $48 for 4 doses to $168 for 14. Ro's pricing page lists the common plans up to $120 for 10 doses. Quarterly plans are available and get a $15 discount every 3 months. Shipping is free. Your provider recommends the plan, and the subscription renews until you change it in your Ro account.

• 4 doses a month: $48
• 10 doses a month: $120
• 14 doses a month: $168

For context, Ro's own FDA-approved generic sildenafil is $4 a dose for 25 mg, $6 for 50 mg and $10 for 100 mg, with an 8-dose monthly minimum ($32 a month at 25 mg). Daily generic tadalafil at Ro is $8 a dose. A Ro Sparks dose costs more than any single generic sildenafil dose at Ro. See our Hims vs Ro comparison for the full Ro price list.

Ro says Sparks works in about 15 minutes on average after the drop dissolves, and the tadalafil keeps it active for up to 36 hours. The drop takes about 10 minutes to dissolve, so plan on roughly 25 minutes from placing it to effect. Ro says to take it at least 15 minutes before sex, avoid eating or drinking while it dissolves, and that meals should not slow it down because it is absorbed under the tongue.

The 36 hours is a window, not a 36-hour erection. Ro says the medication "stays available in your body to support erections when you're sexually stimulated within that window." Sexual stimulation is still needed.

Place one drop under your tongue and let it dissolve completely. Ro's safety information says do not chew it, though once it has dissolved a little you can bite it in two and put it back under the tongue to melt faster. Take it at least 15 minutes before sex. Do not take more than one dose in 24 hours, and do not take it within 24 hours of any other ED medication containing sildenafil or tadalafil. If you already use Viagra, Cialis or a generic, talk to your provider before switching.

Ro lists the most common side effects of Sparks as headache, flushing, indigestion, abnormal vision, nasal congestion, back pain, muscle pain, nausea, dizziness, rash and limb pain. These are the known side effects of sildenafil and tadalafil, which MedlinePlus lists for each drug.

• Low blood pressure: Ro's safety information says this compounded drug contains two PDE5 inhibitors and to watch for signs of severely low blood pressure, such as dizziness, fainting or a prolonged erection.
• Alcohol: Ro says heavy drinking may increase the risk of a blood pressure drop, dizziness or lightheadedness.
• Allergens: Sparks contains Red Dye No. 40 and Yellow Dye No. 5 (tartrazine), and may contain coconut from the compounding process.

For a healthy adult whose clinician approves it, the two ingredients are well studied on their own. The combination dose is compounded, so the FDA has not reviewed it. Two points to know before you start:

• Tadalafil dose: each Sparks dose has 22 mg of tadalafil. The FDA label for Cialis lists 20 mg as the maximum recommended as-needed dose. Ro itself notes each drop "contains a high dose of tadalafil."
• Two PDE5 inhibitors at once: the FDA labels for Viagra and Cialis do not cover taking them together. Ro's safety information treats this as a reason to watch for low blood pressure.

Do not take Ro Sparks if you take nitrates such as nitroglycerin or isosorbide, or a guanylate cyclase stimulator such as riociguat. Ro also asks about heart conditions, bleeding disorders or ulcers, kidney or liver disease, pulmonary hypertension and retinitis pigmentosa. Answer the intake completely, because the provider only knows what you report.

You complete an online visit about your health history and ED symptoms, which Ro says most people finish in about 20 minutes. A Ro-affiliated licensed provider reviews it in about 24 hours. If prescribed, the medication ships free in discreet packaging and arrives in 4 to 7 days. Ro includes free, unlimited follow-up messaging, and the provider can change your treatment. You manage refills and the subscription in your Ro account.

• Ro Sparks: sildenafil 55 mg and tadalafil 22 mg, $12 a dose.
• BlueChew MAX and Gold: MAX combines sildenafil and tadalafil; Gold adds apomorphine and oxytocin and costs $7.30 to $23.17 a dose. See our BlueChew review.
• Rugiet Ready: sildenafil, tadalafil and apomorphine in a troche; Rugiet's own blog quotes about $7.29 to $19.96 a dose. See our Rugiet review.
• Hims Hard Mints: Hims lists 3-in-1 Hard Mints from $30 a month. See our Hims Hard Mints review.

All four are compounded and none is FDA-approved. Of the combinations above with published ingredients, Sparks is the simplest: two standard PDE5 ingredients and no apomorphine or oxytocin.

Pros

• Clear published price: $12 a dose, with plan totals shown
• Dissolves under the tongue, no need to plan around meals
• Only standard ED ingredients, no apomorphine or oxytocin
• Free shipping and unlimited follow-up messaging
• Ro also sells FDA-approved generics if you want to switch

Cons

• Compounded, not FDA-approved
• Costs more per dose than Ro's own generic sildenafil
• 22 mg tadalafil is above Cialis's 20 mg labeled as-needed maximum
• Contains Red No. 40 and Yellow No. 5, may contain coconut
• Subscription billing

Ro Sparks suits an adult whose provider recommends a combination, who wants an under-the-tongue format and a long window from one dose, and who is comfortable with a compounded product at $12 a dose.

Consider a generic first if you have not tried sildenafil or tadalafil alone, want an FDA-approved product, or want the lowest price. Nu Image Medical and HealthyMale (cards above) list generics for less, and DrHouse lets you fill a prescription at any pharmacy. For the whole field, see the best ED telehealth providers.

• Ro Sparks product page (price, plans, onset, duration, FAQ, allergens, side effects, reviews, consult timeline): ro.co/erectile-dysfunction/sparks (checked 2026-10-30)
• Ro Sparks Important Safety Information (55 mg and 22 mg strength, contraindications, how to take): ro.co/safety-info/ro-sparks (checked 2026-10-30)
• Ro ED price list: ro.co/pricing (checked 2026-10-30)
• Tadalafil maximum as-needed dose: DailyMed, Cialis prescribing information
• Sildenafil and tadalafil side effects: MedlinePlus, Sildenafil, MedlinePlus, Tadalafil
• Compounded drugs: FDA, Compounding and the FDA: Questions and Answers