Why is 20mg tadalafil more expensive per mg than 5mg?

Short answer: not always, but often yes. The price per milligram for tadalafil can be higher at 20 mg than at 5 mg because pharmaceutical pricing isn’t linear. A few key factors drive this:

- Market structure and competition
- 5 mg doses are usually more common and widely genericized, so there’s more competition and lower per-mg pricing.
- 20 mg doses may have less generic competition in some markets and can be more brand-dominated, which tends to push the price per mg higher.

- Fixed costs and packaging
- Much of a drug’s cost comes from fixed costs (development, regulatory compliance, packaging, distribution). Those costs are spread over the number of milligrams in a tablet. A 20 mg tablet doesn’t simply scale the same way as four 5 mg tablets in terms of price, so the per-mg cost can end up higher.

- Dosing categories and insurance
- 5 mg is often used for daily therapy and has different insurance coverage, rebates, and copay tiers than the 20 mg on-demand dose. If the 20 mg formulation is more often sold as a brand-name product, patient out-of-pocket can be higher.
- Rebates and discount programs vary by dose; sometimes the 20 mg dose isn’t included in as many discount programs as the 5 mg dose.

- Packaging and dispensing
- The number of tablets per bottle and the way the product is packaged can affect per-mg price. Smaller counts or differently labeled packages (e.g., 2 x 10 mg vs 1 x 20 mg) change the effective price per mg.

What this means for you
- Price per mg is a misleading way to compare costs. It’s more meaningful to compare:
- price per dose (per tablet or per recommended daily amount)
- price per month of therapy (depending on your dosing schedule)
- generic vs brand options
- different pack sizes and retailer discount programs

If you want, tell me your country and whether you’re looking at a brand-name or generic version, and I can help estimate typical price-per-dose and suggest ways to minimize cost (e.g., comparing generics, different pack sizes, or discount programs).