Sexual complaints related to desire, arousal, orgasm and painful intercourse are common in women. Since the last Medical Letter article on this subject, some new information has become available.

Alzheimer's disease (AD) is the most common cause of dementia, but cognitive decline is also associated with other neurological conditions such as Parkinson's disease, dementia with Lewy bodies, vascular dementia, and frontotemporal dementia.

The gram-positive anaerobic bacillus Clostridium difficile is the most common identifiable cause of antibiotic-associated diarrhea. The antibiotics most often implicated have been ampicillin, second and third generation cephalosporins, clindamycin and fluoroquinolones. The emergence in recent years of a new, more toxic epidemic strain (BI/NAP1), possibly related to widespread use of fluoroquinolones, has caused a marked increase in the incidence and severity of C. difficile-associated disease (CDAD).

Use of a proton pump inhibitor (PPI) to protect against gastrointestinal (GI) bleeding in patients taking the antiplatelet agent clopidogrel (Plavix) may interfere with the activation of clopidogrel and diminish its antiplatelet effect, increasing the risk of cardiovascular events.1 A randomized, placebo-controlled trial (COGENT) has found that use of the PPI omeprazole in patients taking clopidogrel in addition to aspirin decreased the incidence of GI bleeding without increasing the risk of a cardiovascular event, but the number of cardiovascular events was small and the formulation of...

A new enteric-coated delayed-release formulation of risedronate (Atelvia – Warner Chilcott) has been approved by the FDA for treatment of postmenopausal osteoporosis. Unlike immediate-release risedronate (Actonel) and all other oral bisphosphonates, which must be taken after an overnight fast and at least 30 minutes before eating breakfast, the new formulation is taken immediately after breakfast with at least 4 ounces of water. Then the patient must remain upright for at least 30 minutes.CLINICAL TRIAL — Approval of Atelvia was based on a 52-week non-inferiority study in more than 900...

A randomized, placebo-controlled trial evaluating the addition of the direct renin inhibitor aliskiren (Tekturna – Novartis) to an angiotensin-converting enzyme (ACE) inhibitor or angiotensin receptor blocker (ARB) in 8606 patients with type 2 diabetes and renal impairment (ALTITUDE) was terminated prematurely by the manufacturer because the combined incidence of cardiovascular and renal events was higher in patients who received aliskiren than in those who received placebo.1Combining two different types of drugs that block the renin angiotensin system in patients at high-risk for...

The FDA has approved a new extended-release capsule formulation of topiramate (Qudexy XR – Upsher Smith), which can be opened and sprinkled on food for patients who have difficulty swallowing tablets or capsules, for treatment of epilepsy. Qudexy XR was marketed as a branded drug in March 2014 and as a generic drug four months later. An earlier extended-release formulation (Trokendi XR) must be swallowed whole.Trokendi XR is approved for initial monotherapy in patients ≥10 years old with partial-onset seizures or primary generalized tonic-clonic seizures and for adjunctive therapy in...

In 2007, an FDA advisory committee asked that placebo-controlled, dose-ranging trials be conducted to establish the efficacy of the oral decongestant phenylephrine (Sudafed PE, and others), which is sold over the counter (OTC) as a single agent and in combination with other drugs for treatment of cold and allergy symptoms. Phenylephrine replaced pseudoephedrine (Sudafed, and others) in many OTC formulations when access to pseudoephedrine-containing products was restricted in an effort to reduce their use in the synthesis of methamphetamine.CLINICAL STUDIES — In a randomized, open-label,...

The once-monthly, subcutaneously injected calcitonin gene-related peptide (CGRP) receptor antagonist erenumab-aooe (Aimovig) was approved by the FDA in 2018 for preventive treatment of migraine in adults. Now the FDA has added a new warning to its labeling about a risk of new-onset hypertension and worsening of preexisting hypertension associated with use of the drug. CGRP is a potent microvascular vasodilator; blocking or deleting it has produced hypertensive effects in animals.

The FDA has approved release of omalizumab (oh mah lye zoo mab; Xolair - Genentech, Novartis), a humanized monoclonal antibody given subcutaneously that binds to immunoglobulin E (IgE). The drug is labeled for patients at least 12 years old with moderate to severe persistent asthma who have shown reactivity to an allergen and whose symptoms are inadequately controlled by an inhaled corticosteroid. The manufacturer claims the drug can help stop allergic reactions before they begin.