Are there side effects from using Rogaine (minoxidil) foam (womens)? Can you where a shower cap to bed so you don't get it anywhere on your face? Thank you

Hardly ever. Apply to scalp. Measured amount. No need for shower cap. A few people get local reaction, but I have never seen it. Helps some women keep more hair if used religiously twice a day for years. Generic 2% minoxidil is about as good as any other form and costs $4 a month.