Retrospective Evaluation on the Analgesic Activities of 2 Compounded Topical Creams and Voltaren Gel in Chronic Noncancer Pain

Topical Formulation of Tramadol 5% in the Management of Osteoarthritis of the Knee: A Double-Blind, Randomized, Prospective, Placebo-Controlled Clinical Trial

The goal of the present study was to evaluate the efficacy of topical tramadol in the management of knee osteoarthritis pain. Sixty patients with moderate to severe pain of knee osteoarthritis were enrolled. Patients were randomized to receive tramadol 5% or placebo along with oral diclofenac 100 mg/day. They were instructed to apply the ointment every 12 h on the knee for three weeks. To control breakthrough pain, the patients were allowed to take acetaminophen up to 650 mg per day. The measured variables were Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and Visual Analog Scale (VAS). Sixty patients completed the study. At the end of follow-up period, VAS decreased by 21% (from 7.2 ± 2.1 to 5.7 ± 2.4, p-value < 0.05) and WOMAC score decreased by 23% (from 49.6 ± 17.4 to 38.4 ± 18.1, p-value < 0.05) in intervention group. Topical tramadol was significantly effective in reducing the intensity of pain and osteoarthritis symptoms in comparison to placebo considering VAS (5.7 ± 2.4 vs. 8.0 ± 2.9, p-value = 0.001) and WOMAC score (38.4 ± 18.1 vs. 46.0 ± 18.6, p-value = 0.007). Topical tramadol 5% appears to be effective in moderate to severe knee osteoarthritis pain.

In vivo methodologies to assist preclinical development of topical fixed-dose combinations for pain management

The combination in a fixed dose of two or more active pharmaceutical ingredients in the same pharmaceutical dosage form is an approach that has been used successfully in the treatment of several pathologies, including pain. In the preclinical development of a topical fixed-dose combination product with analgesic and anti-inflammatory activities for pain management, the main objective is to establish the nature of the interaction between the different active pharmaceutical ingredients while obtaining data on the medicinal product safety and efficacy. Despite the improvement of in vitro assays, animal models remain a fundamental strategy to characterise the interaction, efficacy and safety of active pharmaceutical ingredients at the physiological level, which cannot be reached by in vitro assays. Thus, the main goal of this review is to systematise the available animal models to evaluate the efficacy and safety of a new fixed-dose combination product for topical administration indicated for pain management. Particular emphasis is given to animal models that are accepted for regulatory purposes.

Topical Fixed-Dose Combinations: A Way of Progress for Pain Management?

Pain, a severe public health problem, can affect patient quality of life when inadequately controlled. Considering that pain pathophysiological mechanisms are complex, combining active pharmaceutical ingredients (APIs) with multiple and synergistic mechanisms of action represents a potentially more effective therapeutic approach than conventional monotherapy treatments. In turn, topical drug delivery has clear advantages over other routes of administration, such as high levels of efficacy, better safety profile and great patient compliance. In this context, the combination of two or more APIs in a single dosage form - fixed-dose combination product (FDC) - for topical administration may represent a promising therapeutic option in the field of pain management. Considering the above mentioned, the purpose of this manuscript is to address an overview of some general aspects regarding pain management and FDCs, as well as the regulatory environment that has to be taken into consideration during their development. Special emphasis will be given to fixed-dose combinations for topical administration with analgesic and/or anti-inflammatory activity. Market drivers of the topical FDC currently approved are ultimately pointed out, and new opportunities in pain management highlighted.

Comprehensive Review of Topical Analgesics for Chronic Pain

PURPOSE OF REVIEW

Topical analgesics are a non-opioid option for the treatment of chronic pain conditions including neuropathic pain, musculoskeletal pain, and osteoarthritis. There are many topical medications available; however their efficacy is variable. This article reviews the various topical analgesics, their mechanisms of action, and their efficacy.

RECENT FINDINGS

Studies have found topical NSAIDs are useful in treating acute musculoskeletal pain syndromes (strains and sprains) and show some efficacy in treating hand and knee osteoarthritis (Derry et al. Cochrane Database Syst Rev 5:CD008609, 2017). Topical capsaicin 8% has been shown to be efficacious in the treatment of postherpetic neuralgia, painful diabetic peripheral neuropathy, and HIV-neuropathy (Derry et al. Cochrane Database Syst Rev 1:CD007393, 2017). Topical lidocaine has been widely studied and found to reduce pain in patients with postherpetic neuralgia (Knezevic et al. Pain Manag 7:537-58, 2017). Although many other topical analgesics are available, there is limited data to support the efficacy of other agents. Topical analgesics are a relatively benign treatment for chronic pain conditions including neuropathic pain, musculoskeletal, and myofascial pain. There is evidence to support the use of topical NSAIDs, high concentration topical capsaicin, and topical lidocaine for various painful conditions.

Musculoskeletal ultrasound-guided physical therapy in hemiplegic shoulder pain: A CARE-compliant case report

RATIONALE

The use of musculoskeletal ultrasound (MU) method in the diagnosis of shoulder pain and injury and guidance of injection and pain blocking has been established. However, the treatment of posthemiplegic shoulder pain (HSP) with MU-guided precise physical therapy has not been reported.

PATIENT CONCERNS

Here, we present the first case report of a 64-year-old man with a right basal ganglia hemorrhage. Left side shoulder pain remained unbearable, which seriously affected sleep and shoulder-related activities.

INTERVENTIONS

The patient received MU-guided precise drug administration, laser, and other physical therapy in addition to exercise training for 2 months.

OUTCOMES

The pain was significantly relieved and shoulder function was improved. Effusion extent and tendon thickness were reduced.

LESSONS

MU-guided precise physical therapy can effectively reduce symptoms of HSP and improve inflammation and effusion absorption of lesioned tissue.