The first line of treatment in pain
management usually involves the use of pharmaceuticals from various
therapeutic classes such as antidepressants, opioids, NSAIDs,
anticonvulsants, anesthetics, and other non-narcotic analgesics.
Anticonvulsants, also known as antiepileptic drugs, were developed
primarily for the treatment of epileptic seizures. However, leading
anticonvulsant drugs such as Lyrica (pregabalin) and Neurontin
(gabapentin) have also been approved for the management of various pain
indications including fibromyalgia, migraine and neuropathic pain. These
approvals are responsible for the increasing importance of
anticonvulsants in the management of various pain indications. The
overall market for anticonvulsants is highly genericized; however, the
market for anticonvulsants for pain management application is dominated
by Lyrica, the only branded pharmaceutical among the currently marketed
drugs.
Of the major anticonvulsant drugs
currently marketed, Lyrica (pregabalin), Neurontin (gabapentin), Topamax
(topiramate), Depakote (divalproex), and Carbatrol/Tegretol
(carbamazepine) are indicated for management of various types of pain.
In 2012, Lyrica registered sales of US$ 5,111 Mn, of which 74%
constituted revenue from its pain management indication. Since all the
other molecules are generic and have negligible contribution in the pain
management application, the market will be driven and dominated by the
sales of existing blockbuster drug Lyrica, which constituted 73.4% share
of the total market in 2011. The drug was initially set to lose its
patent exclusivity in 2015, which would have negatively impacted the
market rendering it completely generic. However, Pfizer has obtained
market exclusivity for the drug and its use in pain management through
to 2018, and is therefore expected to maintain its leadership position.
Rising prevalence of epilepsy is the key
driver of the anticonsultants drug market. Anticonvulsants drug is not
only consumed in case of epileptic seizures, but also for pain
management in migraine, and fibromyalgia. This boosts the
anticonvulsants drug market. Availability of alternative options for
pain management acts as a major restraint of the market. Other pain
management methods include the use of medical devices such as analgesic
pumps and minimally invasive procedures such as denervation or
rhizotomy. Pain management implants and devices such as neuromodulators
are gaining market acceptance among medical professionals, while
acupuncture and acupressure are world-renowned pain relief techniques
along with physiotherapy that people adopt. Other devices included in
pain relief are transcutaneous electrical nerve stimulation (TENS) that
delivers mild shocks to nerves in order to block pain messages to the
brain. Hence, competition in the market from other improved pain
management methods, devices, and other drugs can also hamper the
anticonvulsants drug market. The anticonvulsants drug market has been
segmented based on therapeutic class, disease indication, formulation,
distribution channel, and region.
In terms of region, the anticonvulsants
drug market has been classified into Asia Pacific, Europe, Middle East
& Africa, North America, and Latin America. Key players in the
anticonvulsant drug market are Abbott Laboratories, Teva Pharmaceutical
Industries Ltd., Johnson & Johnson Services, Inc., Novartis AG,
Pfizer, Inc., Valeant Pharmaceuticals International, Inc., Sanofi, UCB,
Shire plc., and Astrazeneca plc.
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