Combination products<unk>  is often combined with phenylpropanolamine to form an allergy medication with both antihistamine and decongestant properties, though phenylpropanolamine is no longer available in the US after studies showed it increased the risk of stroke in young women.<unk>  remains available with no such risk.<unk>  may be combined with the opioid hydrocodone.<unk> /dihydrocodeine immediate-release syrups are also marketed. The antihistamine is helpful in cases where allergy or common cold is the reason for the cough; it is also a potentiator of opioids, allowing enhanced suppression of cough, analgesia, and other effects from a given quantity of the drug by itself. In various places in the world, cough and cold preparations containing codeine and<unk>  are available. In the drug Coricidin,<unk>  is combined with the cough suppressant dextromethorphan.
Chlorphenamine
Phenethylamine
Methoxyphenamine
Beclamide
Nicergoline
Phenoxypropazine
Mephentermine
Brompheniramine