Formulation and Evaluation of Calamine and Salicylic Acid Medicated Dusting Powder

Topical dusting powders are finely divided solid preparations intended for external application to reduce friction, absorb moisture, and deliver medicaments locally [1,10]. These preparations are particularly useful in dermatological therapy due to prolonged skin contact and improved patient compliance [2,12]. Calamine, primarily composed of zinc oxide with a small amount of ferric oxide, exhibits soothing, protective, and antipruritic effects [3,8]. Zinc oxide acts as a mild astringent and skin protectant, reducing irritation and inflammation [16]. Salicylic acid is a beta-hydroxy acid widely used for its keratolytic, comedolytic, and antimicrobial properties [4,14]. It enhances desquamation of the stratum corneum and is effective in acne and superficial fungal infections [15]. Powder formulations require appropriate excipients to ensure stability, flowability, and uniform distribution of active ingredients [11,13]. Talc and starch function as absorbent bases, while magnesium stearate improves flow properties [13,20]. Evaluation of flow properties such as bulk density, tapped density, Carr’s index, Hausner’s ratio, and angle of repose is essential to determine powder performance [6,18,19]. The present study focuses on formulation development and systematic evaluation of calamine and salicylic acid medicated dusting powder according to pharmacopeial guidelines [3,5,9].

Types: There are 2 types of dusting powder:

1) Medical Dusting Powders:

Medical powders are intended for minor and superficial skin problems. They must be free from harmful microorganisms. Since some mineral components can carry spores responsible for infections such as tetanus or gas gangrene, proper sterilization is necessary. These powders should not be applied to open wounds or damaged skin, and this warning is clearly stated on the label.

2) Surgical Dusting Powders:

Surgical dusting powders are sterile preparations used in body cavities, deep or major wounds, burns, and on the umbilical cords of newborn babies. They are manufactured under strict sterile conditions to ensure patient safety. [21]

2. MATERIALS AND METHODS

2.1 MATERIALS

All ingredients used were of pharmaceutical grade and complied with pharmacopeial specifications [3,9]

2.2. Formulation composition

Parameter	Observation
Colour	Light pink
Odor	Odourless
Texture	Smooth
Appearance	Fine and free flowing

Fig.1 Organoleptic Properties

Sieve No	% Retained
60	5
80	20
100	75

Fig. 2 Particle size distribution

Fig.3 Bulk &Tapped density

Fig.4 Angle of Repose

4.4 pH and moisture content                           

Fig.5 Determination of pH

Fig.6 Moisture content

4.5 Skin Irritation Test

No erythema, edema, or irritation observed within 24 hours, indicating safety

Fig.7 Skin Irritation Test

DISCUSSION

The prepared dusting powder was light pink, smooth, and free flowing. Fine particle size ensures better adhesion and therapeutic efficacy [12]. Flow property parameters indicated good powder performance with Carr’s index below 15% and angle of repose less than 30°, suggesting excellent flow characteristics [6,18]. The pH (6.2) was within acceptable range for topical use, ensuring skin compatibility [8]. Moisture content was minimal, contributing to formulation stability [5]. No signs of irritation were observed, confirming safety of the formulation [7]. The combined action of calamine and salicylic acid provides both soothing and keratolytic effects, making the formulation suitable for minor dermatological conditions [4,14,16].

CONCLUSION

The calamine and salicylic acid medicated dusting powder was successfully formulated and evaluated as per pharmacopeial and industrial standards [3,6]. The formulation demonstrated satisfactory physicochemical properties, good flow characteristics, and absence of irritation. It can be considered safe and effective for topical therapeutic application.

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