Tadalafil: what it does, how to use it, and where to buy

Tadalafil treats erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH). It relaxes blood vessels to improve blood flow. You’ve probably heard the brand name Cialis — generic tadalafil works the same and is often cheaper.

Two common ways to take tadalafil: a daily low dose (usually 2.5–5 mg) for steady effect, or a higher single dose (10–20 mg) taken before sex. Single doses can start working in about 30–120 minutes and may last up to 36 hours. Daily dosing is useful if you want more spontaneous timing or if you also have BPH symptoms. Always follow the dose your doctor prescribes.

Expect mild side effects at first: headache, flushing, nasal congestion, back pain, and muscle aches. They usually go away in a few hours or a day. Rare but serious problems include sudden vision loss, sudden hearing loss, or an erection lasting more than four hours (priapism). Seek emergency care if any of those happen.

Key drug interactions to watch for: never combine tadalafil with nitrates (like nitroglycerin) — that can cause a dangerous fall in blood pressure. Be careful with alpha-blockers and multiple blood pressure medicines; doctors often adjust doses. Some antifungals, antibiotics, and HIV meds can change tadalafil levels too. Tell your provider about every medicine and supplement you take.

Not everyone should use tadalafil. People with unstable heart disease, recent heart attack or stroke, very low blood pressure, or severe liver or kidney disease need a doctor’s evaluation first. If you have retinal disorders or are taking nitrate patches, avoid tadalafil. Your prescriber will weigh benefits and risks and may suggest a different option.

Quick facts

How long it lasts: up to 36 hours for a single dose. Food: tadalafil can be taken with or without food; heavy fatty meals may delay how fast it works. Alcohol: drinking heavily can worsen side effects and reduce performance. Storage: keep tablets in a cool, dry place away from children.

Safe buying tips

Buying tadalafil online can be safe if you follow a few rules. Use licensed pharmacies that require a prescription and show clear contact details. Avoid sites that sell without a prescription or offer extremely low prices — those often sell counterfeit or unsafe products. Look for pharmacy seals, read independent reviews, and check for a physical address. When in doubt, ask your doctor for a trusted online pharmacy recommendation.

Start with the lowest effective dose and track how you feel. Keep a short log: dose, time, alcohol use, and any side effects. Share that with your prescriber so they can fine-tune treatment. If cost is an issue, ask about generic tadalafil — it’s usually as effective as the brand name for most people.

Got questions about interactions with other meds, driving, or travel? Mention them at your appointment. A quick chat with your provider clears up risks and helps you use tadalafil safely and confidently.