Cyclobenzaprene, the generic form of Flexeril, which is a skeletal muscle relaxant, can increase the effects of certain nasal decongestants. I don't know which ones are in Nyquil, (you can read the label to see which ones are in it), but the nasal decongestants that it can increase the effects of are: naphazoline, oxymetazoline, phenylephrine, and xylometazoline.
No negative interaction. There are marketed drugs such as Phenflu that have combine those drugs also with an expectorant
According to drug interaction checker that I use for this sort of thing there is no interaction between these two drugs. However, You did not stat exactly the form of either drug. If you want to check for yourself go to the related link below (Drugs interaction checker)
nyquil
Nyquil and Biaxin have no known drug interactions. However, each medication has its own individual side effects such as drowsiness.
There are no contraindications between the medications. But before you add or remove a medication/supplement/vitamin from your diet, consult your doctor or pharmacist. There may be a reaction between other medications you are taking.
There are no known drug interactions between Nyquil and the birth control pill.I've taken NyQuil and dayquil with velivet birth control and some times I do fine while other times I get a bit nauseous. When I eat a healthy I feel much better but I have vomited afterwards due to not eating well. So if it is absolutely necessary, you are more prone to getting sick if you do not it a good nutricious meal. However, different things work differently for different people so good luck.
nyquil drug test
Nyquil is an over-the-counter medication, meaning you do not need a prescription to obtain it. It is not illegal. No employer drug test that I know of would deny you employment for having used Nyquil (assuming you're not using it at work!). I don't even think it has components that are tested for in a standard drug test.
There shouldn't be any interaction, but check with your physician or pharmacist.
NO
Definitly Not
no