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Topical Minoxidil Seasonal Use Considerations: A Clinical Guide

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At a glance

  • Product / topical minoxidil 5%, over the counter [1][2]
  • Seasonal dosing change / none in the Rogaine labels [1][2]
  • Men's 5% solution / 1 mL twice daily, top of the scalp only [1]
  • Women's 5% foam / half a capful once daily [2]
  • First possible results / 2 months for men, 3 months for women [1][2]
  • Scalp rule / labels say not to use on red, inflamed, infected, irritated or painful skin [1][2]
  • Foam warning / extremely flammable during and just after application [2]

Does weather change how minoxidil works?

The Rogaine labels do not change directions by month or by weather. Men using the 5% solution apply 1 mL twice daily to the top of the scalp; the label says using more or more often will not improve results, and continued use is necessary or hair loss will begin again [1]. The women's 5% foam label gives half a capful once daily [2].

Hot, sweaty or irritated scalp

The topical labels say not to use minoxidil if the scalp is red, inflamed, infected, irritated or painful, and not to apply it on other parts of the body [1][2]. Both labels also carry a heart-disease warning before use, and their stop-use lists include chest pain, rapid heartbeat, faintness, dizziness, unexplained weight gain, hand or foot swelling, scalp irritation or redness, and unwanted facial hair growth [1][2]. The women's 5% foam label says extremely flammable and to avoid fire, flame or smoking during and immediately following application [2]. The men's 5% solution label says flammable and to keep the product away from fire or flame [1].

Foam versus solution for local irritation

The 5% foam was developed in a propylene glycol-free vehicle [6]. In a 24-week trial of 113 women, once-daily 5% foam was noninferior to twice-daily 2% solution for target-area hair count and hair width, with significantly lower local intolerance, especially pruritus and dandruff (P=.046) [7]. Participants were not blinded, because the formulations differ [7]. That trial compared foam with the 2% solution, not with the men's 5% solution [7].

How long before judging results

For men using the 5% solution twice daily, the label says results may occur at 2 months and some men may need at least 4 months; its stop-use list includes seeing no regrowth in 4 months [1]. For women using the 5% foam once daily, the label says results may occur at 3 months and some women may need at least 6 months; its stop-use list includes seeing no regrowth in 6 months [2].

Frequently asked questions

Does minoxidil work differently in summer or winter?
The Rogaine labels do not give different directions by season. Men using the 5% solution apply 1 mL twice daily to the top of the scalp; the label says using more or more often will not improve results [1].
Can I use it on an irritated scalp?
The topical labels say not to use minoxidil if the scalp is red, inflamed, infected, irritated or painful [1][2].
Is the foam flammable?
The women's 5% foam label says extremely flammable and says to avoid fire, flame or smoking during and immediately following application [2].
Does foam cause less scalp irritation than solution?
In a trial of 113 women, 5% foam once daily caused significantly less local intolerance than 2% solution twice daily, especially pruritus and dandruff (P=.046) [7]. That trial did not compare foam with 5% solution [7].
Will I lose regrowth if I stop?
The labels say continued use is necessary to increase and keep hair regrowth, or hair loss will begin again [1][2].

References

  1. U.S. National Library of Medicine, DailyMed. Men's Rogaine Extra Strength minoxidil 5% topical solution, Kenvue prescribing information. Men's Rogaine Extra Strength minoxidil 5% topical solution, Kenvue label
  2. U.S. National Library of Medicine, DailyMed. Women's Rogaine minoxidil 5% topical foam, Kenvue prescribing information. Women's Rogaine minoxidil 5% topical foam, Kenvue label
  3. Drugs@FDA: FDA-Approved Drugs. Drugs@FDA: FDA-Approved Drugs
  4. Olsen EA, Dunlap FE, Funicella T, Koperski JA, Swinehart JM, Tschen EH, et al. A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol. 2002;47(3):377-85. A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men
  5. Lucky AW, Piacquadio DJ, Ditre CM, Dunlap F, Kantor I, Pandya AG, et al. A randomized, placebo-controlled trial of 5% and 2% topical minoxidil solutions in the treatment of female pattern hair loss. J Am Acad Dermatol. 2004;50(4):541-53. A randomized, placebo-controlled trial of 5% and 2% topical minoxidil solutions in the treatment of female pattern hair loss
  6. Olsen EA, Whiting D, Bergfeld W, Miller J, Hordinsky M, Wanser R, et al. A multicenter, randomized, placebo-controlled, double-blind clinical trial of a novel formulation of 5% minoxidil topical foam versus placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol. 2007;57(5):767-74. A multicenter, randomized, placebo-controlled, double-blind clinical trial of a novel formulation of 5% minoxidil topical foam versus placebo in the treatment of androgenetic alopecia in men
  7. Blume-Peytavi U, Hillmann K, Dietz E, Canfield D, Garcia Bartels N. A randomized, single-blind trial of 5% minoxidil foam once daily versus 2% minoxidil solution twice daily in the treatment of androgenetic alopecia in women. J Am Acad Dermatol. 2011;65(6):1126-1134.e2. A randomized, single-blind trial of 5% minoxidil foam once daily versus 2% minoxidil solution twice daily in the treatment of androgenetic alopecia in women
Evidence overview for Topical Minoxidil Seasonal Use Considerations: A Clinical Guide