「鼻炎薬」は、
sinus medicine
sinus medication
ですね。
花粉の季節は鼻炎薬が必須だ。
I need sinus medicine/medication in hay fever season.
↓アダム先生がよく言うセリフ(笑)
”I'm all stuffed up from the pollen. Do you have any allergy meds I can take?”
花粉で（鼻が）詰まってる。アレルギーの薬ある？
stuff up 詰まっている
pollen 花粉
allergy meds アレルギーの治療薬 ※meds…medicationの略
My sinuses are all stuffed up. Could you get my prescription filled while you are out?
鼻が詰まってる。出かけたときに、薬もらってきてくれる？
sinuses 鼻
get a/someone’s prescription filled 処方箋を調剤してもらう
An 'antihistamine' is a pill that elevates the symptoms of hay fever and many other allergies. You can take this if you are allergic to cat fur, or if you are stung by a bee or wasp. It will ease the symptoms.
'Cold medicine' can be bought over the counter in many pharmacies and is a decongestant for runny nose, cough, headache and ache's and pains.
Medicine that is used for a runny nose and hay fever is usually called "flu medicine"or "medicine for hay fever". For example you can say:
-I need to go to the pharmacy to buy medicine for my runny nose.
-I got flu medicine at the pharmacy today
-The medicine for hay fever is very effective. It also helps with headaches.
鼻水と花粉症に使われる薬は普通、「flu medicine」または「medicine for hay fever」と呼ばれます。例えば、以下のように言えるでしょう：
I need to go to the pharmacy to buy medicine for my runny nose.
（鼻水の薬を買いに薬局に行かなけばなりません。）
I got flu medicine at the pharmacy today.
（今日、薬局で花粉症の薬を買いました。）
The medicine for hay fever is very effective. It also helps with headaches.
（その花粉症の薬は良く効きます。頭痛にも効きます。）
Hayfever is an allergy so you can simply say, "I am taking allergy medicine." "Antihistamines" is the correct word for this, but you can use 'allergy medicine' in case people don't understand the word.
花粉症はallergy（アレルギー）ですので、"I am taking allergy medicine."（アレルギーの薬を飲んでいます）と言えます。
antihistamines（抗ヒスタミン剤）が正式名称ですが、これが伝わらなかった時には、allergy medicineが使えます。
in the hayfever season, I can't do/live without antihistamines （またはrhinitis medicine, decongestantsなど）
「鼻炎」＝ rhinitis （発音：ライナイティス）（医学用語）, stuffy nose （口語）
「鼻炎薬」＝ rhinitis medicine, medicine for rhinitisですが、「antihistamines」（＝抗ヒスタミン剤)や「decongestant」（＝消炎剤）という種類を具体的に言ってもオッケー
「花粉の季節」＝ pollen season, hayfever season
「必須」＝ essential, indispensable, can't do/live without
「花粉の季節は鼻炎薬が必須だ」＝ in the hayfever season, I can't do/live without antihistamines （またはrhinitis medicine, decongestantsなど）
Rhinitis is an allergy caused by pollen, dust, hair or animals when someone is allergic to them it causes cold or flu like symptoms in the sufferer as it usually affects the inside of the nasal or nose area mostly
If a person is allergic to a certain type of allergen for example pollen or dust then they can take antihistamines to help the symptoms and make them feel better
If you have a runny nose due to a cold, then you may need a nasal inhaler to help your breathing.
If you have hay fever, the common products available will probably include antihistamines which are proven to alleviate the symptoms for many people.
"I need a nasal inhaler as my nose keeps running!"
風邪をひいて、鼻水が出るのであれば、呼吸を楽にするためにnasal inhaler（鼻吸入器）が必要かもしれません。花粉症の場合は、一般的な薬には、おそらくantihistamine（抗ヒスタミン剤）が含まれています。これは、多くの人の症状を和らげる効果があることが証明されています。
例文
"I need a nasal inhaler as my nose keeps running!"
（鼻水が止まらないので、鼻吸入器が必要です）
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