Short answer Ask for sildenafil (brand: Viagra or generic sildenafil) if you want an as‑needed option for occasional sex — works in ~30–60 minutes and lasts ~4–6 hours. Ask for tadalafil (brand: Cialis or generic tadalafil) if you want longer spontaneous windows or a daily low‑dose option — works in ~30–60 minutes and can last up to 36 hours (and can be used daily at low dose). Tadalafil is also approved for BPH symptoms. Key safety points (read before taking) Both require a prescription. Don’t take either with nitrates (for chest pain) — this can cause a dangerous drop in blood pressure. Tell the prescriber about heart disease, blood‑pressure meds (especially alpha‑blockers), liver/kidney disease, and other medicines. Common side effects: headache, flushing, nasal congestion. Sildenafil more often causes transient visual changes; tadalafil more often causes muscle/back pain. Use licensed providers and avoid questionable online pharmacies that don’t require a prescription. Where to get both (reputable services) United States: Hims, Roman (Ro), Lemonaid Health — telehealth consult + home delivery; most local chains (CVS, Walgreens, Walmart, Amazon Pharmacy) will fill prescriptions and carry generic sildenafil and tadalafil. United Kingdom: Superdrug Online Doctor, LloydsPharmacy Online, Pharmacy2U — online consults and delivery; brands like Viagra/Cialis and generics available. Canada: Maple, Shoppers Drug Mart online, Well.ca — telehealth or pharmacy fill services that stock generics. Australia: MyDoc, HealthEngine (and most community pharmacies) — many will supply sildenafil and tadalafil with a prescription. If you want, tell me your country or whether you prefer a telehealth app vs local pharmacy and I’ll give a specific, up‑to‑date recommendation and next steps (how to get a prescription, typical dosing options).
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