do NOT mix any of this
There is not much of a difference between the two of these. They are diphenhydramine in different salt forms but will have the same effect. Diphenhydramine citrate will be slightly more readily absorbed in the body than HCl.
There are no known drug interactions between dextromethorphan and the birth control patch
DM stands for DextroMethorphan which is a cough suppressantPE stands for PhenylEphrine which is a decongestant
There are no known drug interactions between guaifenisin, dextromethorphan, and the birth control pill.
If you buy anything with "DM" in the name, it probably already had Dextromethorphan in it. So yes, Guafenesin can be taken with Dextromethorphan but taking too much Dextromethorphan can cause a few undesirable side effects. It's unlikely that you'll be able to buy Dextromethorphan by itself anyway, it will likely come with Acetametaphin and Phenylephrine or Guafenesin.
Diphenhydramine
The chemical formula for diphenhydramine is C17H21NO
The chemical formula for Dextromethorphan Hydrobromide (HBr) is C18H25NO·HBr.
Diphenhydramine is an antihistamine. It is not an antibiotic. It will not cure chlamydia.
Dextromethorphan breaks through the blood-brain barrier. It is a harmful intoxicant which causes severe damage to the brain and psychosis. It should be illegal. For more information, search "Dextromethorphan induced psychosis" online. Dextromethorphan- Induced Psychosis epcms.com/uploadedFiles/vol32num3a1.pdf Dextromethorphan- Induced Mania psy.psychiatryonline.org/cgi/reprint/37/1/71.pdf
organic