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Abstract

Skin permeability and local tissue concentrations of nonsteroidal anti-inflammatory drugs after topical application.

P Singh and M S Roberts
Journal of Pharmacology and Experimental Therapeutics January 1994, 268 (1) 144-151;
P Singh
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M S Roberts
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Abstract

Nonsteroidal anti-inflammatory drugs (NSAIDs) are being administered increasingly by transdermal drug delivery for the treatment of local muscle inflammation. The human epidermal permeabilities of different NSAIDs (salicylic acid, diethylamine salicylate, indomethacin, naproxen, diclofenac and piroxicam) from aqueous solutions is dependent on the drug's lipophilicity. A parabolic relationship was observed when the logarithms of NSAID permeability coefficients were plotted against the logarithms of NSAID octanol-water partition coefficients (log P), the optimum log P being around 3. The local tissue concentrations of these drugs after dermal application in aqueous solutions were then determined in a rat model. The extent of local, as distinct from systemic delivery, for each NSAID was assessed by comparing the tissue concentrations obtained below a treated site to those in contralateral tissues. Local direct penetration was evident for all NSAIDs up to a depth of about 3 to 4 mm below the applied site, with distribution to deeper tissues being mainly through the systemic blood supply. A comparison of the predicted tissue concentrations of each NSAID after its application to human epidermis was then made by a convolution of the epidermal and underlying tissue concentration-time profiles. The estimated tissue concentrations after epidermal application of NSAIDs could be related to their maximal fluxes across epidermis from an applied vehicle.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 268, Issue 1
1 Jan 1994
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Abstract

Skin permeability and local tissue concentrations of nonsteroidal anti-inflammatory drugs after topical application.

P Singh and M S Roberts
Journal of Pharmacology and Experimental Therapeutics January 1, 1994, 268 (1) 144-151;

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Abstract

Skin permeability and local tissue concentrations of nonsteroidal anti-inflammatory drugs after topical application.

P Singh and M S Roberts
Journal of Pharmacology and Experimental Therapeutics January 1, 1994, 268 (1) 144-151;
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