Similar efficacy results were reported during 12-month follow-up: mean IOP decrease from baseline was 4.4-7.6 mmHg with brimonidine/timolol combination, compared to 2.7-5.5 mmHg with brimonidine and 3.9-6.2 mmHg with timolol. The incidence of treatment-related adverse events with the brimonidine/timolol combination was lower than that with brimonidine monotherapy but higher than that with timolol monotherapy.A 12-week prospective, randomized, double-blinded study in 371 glaucoma and ocular hypertension patients with inadequate IOP control on monotherapy compared the efficacy and safety of 0.2% brimonidine tartrate/0.5% timolol fixed combination twice daily with the concomitant use of 0.2% brimonidine tartrate twice daily and timolol 0.5% twice daily. The IOP-lowering effect of the fixed combination group was shown to be non-inferior to that of concomitant therapy. Incidence of adverse events was similar between groups. Society and culture
Commercial aspects
Allergan is the New Drug Application (NDA) holder of brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, which is sold under the COMBIGAN® trademark. The New Drug Application (NDA) for Combigan was approved by the US Food and Drug Administration (FDA) in October 2007. Allergan, Plc is a global specialty pharmaceutical company which develops, manufactures, markets and distributes branded pharmaceutical products, aesthetic products, biosimilar and over-the-counter pharmaceutical products. In 2015, Actavis, Plc acquired Allergan, Inc. for approximately $77 billion and subsequently changed its name to Allergan, Plc. In 2015, the global revenues for Alphagan and Combigan totaled $411.1 million ($285 million from the US market), which accounted for 2.7% of Allergans total net revenues.Allergan holds at least six active patents protecting Combigan from generic competition.
Several generic companies challenged the validity of the patents and filed Abbreviated New Drug Applications (ANDA) seeking market entry. Allergan responded by filing a lawsuit against the ANDA filers. In Allergan, Inc. v. Sandoz, Inc., the US Court of Appeals for the Federal Circuit ruled that Allergans composition-related patent claims were invalid based on obviousness, because brimonidine and timolol had already been marketed in the claimed concentrations. However, Allergans method claim (US Patent No. 7,030,149), which states "reducing the number of daily topical ophthalmic doses of brimonidine administered topically to an eye of a person in need thereof for the treatment of glaucoma or ocular hypertension from 3 to 2 times a day without loss of efficacy", was held to be non-obvious. As a result, generic companies are prevented from marketing generic versions of Combigan until its patent expiration in 2022.Combigan is supplied in 5 mL, 10 mL, and 15 mL bottles. In the United States, the cash price of one 5-mL eye dropper of Combigan ranges from $160 to $190. == References ==