Category Archives: New Drugs

Horizant: Another Option for Postherpetic Neuralgia Therapy

Sometimes medications come to market with a lot of fanfare and Horizant®, a newly formulated pro-drug of the commonly used gabapentin, which was released with FDA approval for restless leg syndrome in April 2011 seems to be one of these. I’d never heard of Horizant until it received FDA approval yesterday for treatment of postherpetic neuralgia in adults.

As a treatment for restless leg syndrome Horizant is almost certainly a niche drug because numerous generic options are available they tend be pretty effective.  Examples include generic Requip, and Mirapex, along with clonazepam and tramadol.  For the treatment of postherpetic neuralgia traditional gabapentin is a suboptimal choice because of the need to gradually taper the gabapentin up to effective dose in patients who really want pain relief much quicker. At the retail online price of about two or $220 per month for the typical 600 mg twice a day dosing Horizant remains higher in price than Lyrica, his primary competition which almost expensive costs in the $170 $180 per month for the 50 to 75 mg twice a day dose.

I’m not sure why using Horizant would be chosen over Lyrica, a medication with a somewhat longer track record and a slightly lower price, but it is good to have another alternative available. Horizant has a generic name gabapentin enacarbil, and is sold as a extended-release 600 mg tablet that is felt to be absorbed through the gastrointestinal tract and subsequently converted to gabapentin.  The manufacturer takes care to note that Horizant is not equal to gabapentin on the milligram for milligram conversion and that the dosage of Horizant may not result in the same plasma gabapentin concentrations as with the use of gabapentin.

The efficacy of Horizant in treatment of restless leg syndrome was evaluated in a 12 week trial along with two supportive studies and the three studies combined only included 574 patients in three countries. This is a relatively small trial and in my opinion the use Horizant for restless leg syndrome is not likely to be frequently utilized.

For postherpetic neuralgia Horizant was assessed in a 12 week control study and the side effects of Horizant were fairly modest. The most common Horizant side effects were somnolence, dizziness, headache, and nausea all of which were slightly more frequent with Horizant then with placebo. Fatigue was noted in 6% of treated patients versus 1% of placebo patients making it a little bit more frequent when compared to placebo than the other side effects mentioned.

In summary  don’t anticipate Horizant to leap to the front as the market leader in treatment of postherpetic neuralgia,  but I do expect it to be an considered as option for patients who various reasons might not tolerate or cannot use Lyrica, and for whom gabapentin is anticipated take too long to get to therapeutic dosage to be chosen.

Generic Boniva: A Welcome Addition to our Generic Drug Options

The bisphosphonates have been very popular for treatment of osteoporosis. On March 19th the FDA approved several manufacturers to sell generic Boniva, ibandronate, at the 150 mg monthly dosage that is commonly used. Unlike many drugs that go generic Boniva has been approved for several manufacturers from the start, so we should expect prices to… Continue Reading

Vesicare: When is it Better than Generic Oxybutynin?

Vesicare is one of the older of the second generation medications for urge incontinence. Vesicare has been around long enough that its earliest patent expiration is anticipated in Dec. 2015. You may not hear much about urge incontinence now, because the more popular term for this is overactive bladder. Overactive bladder is a medical condition… Continue Reading

Gabapentin Recreational Use

When I first heard about gabapentin recreational use at first it seemed bizarre, but recently there have been more reports of the diversion of prescriptions for gabapentin recreational use.  This makes some sense because the one of the primary problems with the use of gabapentin for neuropathic pain is that most people need to start… Continue Reading

Duexis: An Example of a Combination Drug Designed Primarily for Profit

Deuxis®  was brought to market by Horizon Pharma as yet one more combination drug offering.  The argument for taking a second drug to reduce the incidence of the most common serious ibuprofen side effects, namely dyspepsia, symptomatic and asymptomatic gastric ulcers, and gastrointestinal bleeding is fairly convincing. It is especially a valid approach in moderate… Continue Reading

Nosocomial Infections

Nosocomial infections are infections which develop in a hospital setting. In the United States the CDC estimates about 1.7 million nosocomial infections from various types of organisms occur annually. Nearly 100,000 deaths occur each year related to these infections. Over the course of most of my medical career nosocomial infections have been primarily related to… Continue Reading

Victoza and the Incretin System Modulator Medications for Diabetes

Victoza is among what is becoming an increasingly crowded market for drugs that affect the incretin system of pancreatic beta cell function and control of insulin release.  The whole incretin system has been a bit more confusing to me than it needs to be primarily because of the nearly unpronounceable terms and similar acronyms.  I’ve… Continue Reading