Rimantadine and 2-adamantanamine elicit local anesthesia to cutaneous nociceptive stimuli in a rat model

Ching Hsia Hung, Chin Chen Chu, Yu Chung Chen, Yu Wen Chen, Jhi Joung Wang

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14 Citations (Scopus)


The aim of this study was to investigate infiltrative cutaneous anesthesia of 2-adamantanamine and rimantadine. After subcutaneous injections of drugs in rats, the blockade of cutaneous trunci muscle reflex by 2-adamantanamine and rimantadine was evaluated. Lidocaine, a common local anesthetic, was used as control. We showed that rimantadine and 2-adamantanamine as well as the local anesthetic lidocaine produced infiltrative anesthesia of skin in a dose-dependent fashion. Saline (vehicle) group displayed no cutaneous anesthesia. The relative potency of these drugs was rimantadine [23.8 (21.1-26.8)] = lidocaine [26.4 (22.7-30.6)] > 2-adamantanamine [64.6 (55.0-75.9)] (P < 0.01). On an equianesthetic basis [25% effective dose (ED25), ED50, and ED75], rimantadine and 2-adamantanamine had longer duration of action than lidocaine (P < 0.05). Neither local injection of saline nor intraperitoneal administration of a large dose of drugs elicited cutaneous anesthesia (data not shown). These data demonstrated for the first time that rimantadine had a similar potent and longer duration of skin infiltrative anesthesia than did lidocaine, whereas 2-adamantanamine had a less potency but longer duration of cutaneous anesthesia than did lidocaine.

Original languageEnglish
Pages (from-to)199-204
Number of pages6
JournalFundamental and Clinical Pharmacology
Issue number2
Publication statusPublished - 2014 Apr

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Pharmacology (medical)


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