Minoxidil/niacinamide topical Disease Interactions

In general, topically applied minoxidil is poorly absorbed from the normal, intact scalp. However, alteration in scalp epidermal integrity (e.g., abrasion, sunburn, psoriasis) can increase percutaneous absorption with resultant systemic effects, including sodium and water retention, local or generalized edema, pericardial effusion, pericarditis, tamponade, tachycardia, and worsening or development of angina. Therapy with minoxidil should be avoided in patients with diminished or altered scalp integrity that may lead to enhanced systemic absorption, particularly in the presence of underlying cardiovascular dysfunction or fluid retention.