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Lilly didn't reveal financial details of the deal with Sanofi. Under the deal, Sanofi will be responsible for commercializing nonprescription Cialis wherever it receives approval while Lilly will manufacture Cialis for Sanofi. The drug, sold in tablet form, is made by Lilly in Puerto Rico. The two companies hope for a 2018 launch of what they're calling Cialis OTC. That's the same year patents for Cialis are expected to expire in the United States and Europe, allowing cheaper generics to take over and effectively dry up Lilly's considerable profits from the drug.

That’s because the original patent holder, Eli Lilly, shouldered the cost of the research and testing required to bring the drug to market. Pharmaceutical companies manufacturing generic tadalafil bypass those research and development costs because the approved formula is publicly available in the patent. They can sell generic tadalafil for a much lower price and still turn a profit. I always start with the highest dosage because I want to knock this out of the water.

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