Sure. When I use Epitalon IN, I make a 20 mg spray and use 1 mg daily for 20 days until it's gone, usually in the morning. I do the same thing with Semax, but I have used 30 mg to go a month. I have NA Semax available in 30 mg size. Then I have a washout for at least 2 weeks. A month would be better, but 2 weeks seems ok. With Epitalon, I cycle that every 4 months. I do keep them in separate sprayers. They are synergistic, but I usually wait 30-60 minutes between them when running at the same time.
I have P21 coming also, with the Adamantane group for better bioavailability. P21 also lends itself to IN delivery because of its small size. The recommended dosage is 500 mcg - 2 mg. I'll probably start out on the low end, as I usually do. P21 has highly cumulative effects, so I'll go low and slow, for up to six weeks, but at least 4 weeks. There are no human studies, but this one is interesting:
https://www.sciencedirect.com/science/article/pii/S001457931000520X