With hundreds reported killed, the Sweida bloodshed is a major test for interim President Ahmed al-Sharaa, prompting Israel to launch air strikes against government forces last week as it declared support for the Druze.
Fighting continued on Saturday despite a ceasefire call.
Interior Minister Anas Khattab said on Sunday that internal security forces had managed to calm the situation and enforce the ceasefire, "paving the way for a prisoner exchange and the gradual return of stability throughout the governorate".
Reuters images showed interior ministry forces near the city, blocking the road in front of members of tribes congregated there.
The Interior Ministry said late on Saturday that Bedouin fighters had left the city.
US envoy Tom Barrack said the sides had "navigated to a pause and cessation of hostilities".
"The next foundation stone on a path to inclusion, and lasting de-escalation, is a complete exchange of hostages and detainees, the logistics of which are in process," he wrote on X.
Kenan Azzam, a dentist, said there was an uneasy calm but the city's residents were struggling with a lack of water and electricity.
"The hospitals are a disaster and out of service, and there are still so many dead and wounded," he said by phone.
Another resident, Raed Khazaal, said aid was urgently needed.
"Houses are destroyed ... The smell of corpses is spread throughout the national hospital," he said in a voice message to Reuters from Sweida.
The Syrian state news agency said an aid convoy sent to the city by the government was refused entry while aid organised by the Syrian Red Crescent was let in.
A source familiar with the situation said local factions in Sweida had turned back the government convoy.
Israeli public broadcaster Kan reported on Sunday that Israel sent medical aid to the Druze in Sweida and the step was co-ordinated with the US and Syria.
The Druze are a small but influential minority in Syria, Israel and Lebanon who follow a religion that is an offshoot of a branch of Shi'ite Islam.
Some hardline Sunnis deem their beliefs heretical.
The fighting began a week ago with clashes between Bedouin and Druze fighters.
Syria sent troops to quell the fighting but they were drawn into the violence and accused of widespread violations against the Druze.
Residents of the predominantly Druze city said friends and neighbours were shot at close range in their homes or in the streets by Syrian troops, identified by their fatigues and insignia.
Sharaa on Thursday promised to protect the rights of Druze and to hold to account those who committed violations against "our Druze people".
He has blamed the violence on "outlaw groups".
A Syrian security source told Reuters that internal security forces had taken up positions near Sweida, establishing checkpoints in western and eastern parts of the province where retreating tribal fighters had gathered.
On Sunday, Sharaa received the report of an inquiry into violence in Syria's coastal region in March, where Reuters reported in June that Syrian forces killed 1500 members of the Alawite minority following attacks on security forces.
The presidency said it would review the inquiry's conclusions and ensure steps to "bring about justice" and prevent the recurrence of "such violations".
It called on the inquiry to hold a news conference on its findings - if appropriate - as soon as possible.
The Syrian Network for Human Rights said on July 18 it had documented the deaths of at least 321 people in Sweida province since July 13.
The preliminary toll included civilians, women, children, Bedouin fighters, members of local groups and members of the security forces, it said, and the dead included people killed in field executions by both sides.
