At the airport

Security

If you are carrying-on liquid medication exceeding 3 ounces / 100 ml, you must declare it at the security checkpoint for inspection. This would apply to Fuzeon (enfuviritide), the injectable HIV medication, if there were more than 100 doses. Hypodermic needles are generally prohibited items at most security check points, so if you need to inject during the flight you will need to produce documentation.

Immigration

This is where passports and visas (if required) are checked on arrival. It is not usual for searches, or questions about medication to happen at this stage unless the immigration official has suspicions about the validity of your entry into the country or your health status.

Customs

Customs regulations require prescription medication carried into most countries to be accompanied by a letter from the prescribing doctor explaining the purposes of the medicine. This requirement applies to all prescription drugs and is not specific to HIV medication.

If you are stopped on entry by customs, they should not cause any fuss about medication that you are carrying if you have this explanatory letter. People presenting themselves at customs should be searched individually and not in front of others. You may have the right to request a private room or screen.

If the country has restrictions to HIV positive travellers or the carrying of HIV medication, this is the most likely point of discovery, if you are stopped and questioned or searched.

If you have HIV and the country you are entering refuses entry, then you are breaking their immigration rules.  If it is found that you have lied (e.g., if your bags are searched on entry and they find letters or medications which make your HIV status clear) you can be refused entry and deported.

Some people carry a letter from their doctor stating that the medicines are for a chronic illness, but not explicitly stating it is HIV.  They also ensure that no labels make it clear what the medication is for or that they have HIV.  Here you are at the discretion of the immigration officer. 

It really is impossible to judge the risk of this happening so it is a decision only  the individual traveller can make. Many HIV positive visitors have successfully entered prohibited countries without any problems; but others have not been so lucky. THT therefore cannot advise anyone to engage in unlawful activity for the purposes of travel.